Rendering of SV7 - Santa Clara, California QU AR TER ENDED DECEMBER 31, 2015 Earnings Release and Supplemental Information SECURE, RELIABLE, HIGH-PERFORMANCE DATA CENTER SOLUTIONS ®2016 CoreSite Realty Corporation, All Rights Reserved.

Table of Contents Overview Earnings Release Company Profile Summary of Financial Data 3 8 10 Financial Statements Consolidated Balance Sheets Consolidated Statements of Operations Reconciliations of Net Income to FFO, AFFO, EBITDA and Adjusted EBITDA 11 12 13 Operating Portfolio Operating Properties Leasing Statistics Geographic and Vertical Diversification 10 Largest Customers 14 15 17 18 Development Capital Expenditures and Completed Pre-Stabilized Projects Development Summary 19 20 Capital Structure Market Capitalization and Debt Summary Interest Summary and Debt Covenants 22 23 Components of Net Asset Value 24 2016 Guidance 25 Appendix 26 Quarter Ended December 31, 2015 2

CORESITE REPORTS FOURTH-QUARTER REVENUE AND FFO PER SHARE GROWTH OF 25% AND 31% YEAR OVER YEAR, RESPECTIVELY DENVER, CO – FEBRUARY 11, 2016 CoreSite Realty Corporation (NYSE: COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions to a growing customer ecosystem across the U.S., today announced financial results for the fourth quarter ended December 31, 2015. Quarterly and Subsequent Highlights Reported fourth-quarter funds from operations (“FFO”) of $0.80 per diluted share and unit, representing 31.1% growth year over year Reported fourth-quarter total operating revenues of $90.9 million, representing a 25.4% increase year over year Executed a record 155 new and expansion data center leases comprising 42,089 net rentable square feet (NRSF), representing $8.9 million of annualized GAAP rent at a rate of $211 per square foot Commenced 54,329 net rentable square feet of new and expansion leases representing $9.3 million of annualized GAAP rent at a rate of $172 per square foot Realized rent growth on signed renewals of 3.8% on a cash basis and 6.7% on a GAAP basis and recorded rental churn of 2.3% Executed a new five-year, $100 million term loan to increase available liquidity and support growth objectives Tom Ray, CoreSite’s Chief Executive Officer, commented, “We're pleased to report continued execution of our business plan in the fourth quarter, delivering solid growth and finishing out 2015 as another strong year for our company.” Mr. Ray continued, “In addition to our solid financial results for the fourth quarter, we finished 2015 and began 2016 with positive leasing momentum. We remain focused upon driving increased transaction volume across the portfolio and enhancing the value of our assets by serving communities of interest among network carriers, cloud service providers, and enterprises. We believe that we are making attractive investments meant to execute upon favorable market conditions and CoreSite’s strong value proposition to customers.” Financial Results CoreSite reported FFO per diluted share and unit of $0.80 for the three months ended December 31, 2015, an increase of 31.1% compared to $0.61 per diluted share and unit for the three months ended December 31, 2014. On a sequential-quarter basis, FFO per diluted share and unit increased 8.1%. Total operating revenues for the three months ended December 31, 2015, were $90.9 million, a 25.4% increase year over year and an increase of 5.3% on a sequential-quarter basis. CoreSite reported fourth-quarter net income attributable to common shares of $9.3 million, or $0.32 per diluted share. For the year ended December 31, 2015, CoreSite reported FFO per diluted share and unit of $2.86, an increase of 31.2% compared to $2.18 per diluted share and unit in 2014, excluding unusual items in the year-ago period. Total operating revenues were $333.3 million, a 22.3% increase year over year. Full-year 2015 FFO increased 31% year over year, excluding unusual items in 2014, to $2.86 per share

Quarter Ended December 31, 2015 Sales Activity CoreSite executed 155 new and expansion data center leases representing $8.9 million of annualized GAAP rent during the fourth quarter, comprised of 42,089 NRSF at a weighted-average GAAP rental rate of $211 per NRSF. CoreSite’s fourth-quarter data center lease commencements totaled 54,329 NRSF at a weighted average GAAP rental rate of $172 per NRSF, which represents $9.3 million of annualized GAAP rent. CoreSite’s renewal leases signed in the fourth quarter totaled $10.1 million in annualized GAAP rent, comprised of 49,561 NRSF at a weighted-average GAAP rental rate of $204 per NRSF, reflecting a 3.8% increase in rent on a cash basis and 6.7% increase on a GAAP basis. The fourth-quarter rental churn rate was 2.3%. Development Activity Santa Clara – During the fourth quarter, CoreSite had 80,000 square feet of turn-key data center capacity under construction in Phase 1 of SV7, plus 150,000 square feet of powered shell available for development in the SV7 building. As of December 31, 2015, CoreSite had incurred $23.8 million of the estimated $110.0 million required to complete this project and expects to substantially complete construction of Phase 1 in the second quarter of 2016. Additionally, as of the end of the fourth quarter, CoreSite had incurred $18.1 million of the estimated $30.0 million required to complete the previously-announced 136,580 square-foot SV6 build-to-suit development. CoreSite expects to substantially complete SV6 and commence the associated lease during the first half of 2016. Northern Virginia – As of December 31, 2015, CoreSite had 96,274 NRSF of data center space under construction in Phase 3 and Phase 4 at VA2 and had incurred $22.0 million of the estimated $32.5 million required to complete these projects. CoreSite expects to complete construction of both Phase 3 and Phase 4 during the first quarter of 2016. Additional markets – As of December 31, 2015, CoreSite had 14,031 NRSF of turn-key data center capacity under construction at BO1 in Boston. As of the end of the fourth quarter, CoreSite had incurred $9.4 million of the estimated $11.0 million required to complete this project, and expects to complete construction in the first quarter of 2016. In Los Angeles, CoreSite commenced construction on 43,345 square feet at LA2 and had incurred $7.6 million of the estimated $18.0 million required to complete this project. Construction at LA2 is expected to be completed in the first half of 2016. Quarter Ended December 31, 2015 4 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Quarter Ended December 31, 2015 Balance Sheet and Liquidity As of December 31, 2015, CoreSite had net principal debt of $385.4 million, correlating to 2.0 times fourth-quarter annualized adjusted EBITDA, and net principal debt and preferred stock outstanding of $500.4 million, correlating to 2.6 times fourth-quarter annualized adjusted EBITDA. On February 2, 2016, CoreSite entered into a new five-year, $100 million term loan by exercising a portion of the accordion under CoreSite’s $500 million senior unsecured credit facility. CoreSite used the term loan proceeds to pay down a portion of the balance on its existing revolving credit facility, as well as for general corporate purposes. Following the execution of the $100 million term loan, CoreSite had $301.4 million of capacity available under its revolving credit facility. Dividend On December 2, 2015, CoreSite announced a 26% increase in its quarterly dividend to $0.53 per share of common stock and common stock equivalents for the fourth quarter of 2015. The increased dividend reflects an annualized dividend rate of $2.12 per share, compared to the prior annualized dividend rate of $1.68 per share. The fourth-quarter common stock dividend was paid on January 15, 2016, to shareholders of record on December 31, 2015. CoreSite also announced on December 2, 2015, a dividend of $0.4531 per share of Series A preferred stock for the period October 15, 2015, to January 14, 2016. The preferred dividend was paid on January 15, 2016, to shareholders of record on December 31, 2015. 2016 Guidance CoreSite is introducing its 2016 guidance of FFO per diluted share and unit in the range of $3.37 to $3.47. More detail regarding the assumptions underpinning the 2016 annual guidance can be found on page 25 of the fourth-quarter 2015 earnings supplemental. In addition, the company’s estimate of 2016 net income attributable to common shares is $1.13 to $1.23 per diluted share, with the difference between FFO and net income being real estate depreciation and amortization. This outlook is predicated on current economic conditions, internal assumptions about CoreSite’s customer base, and the supply and demand dynamics of the markets in which CoreSite operates. The guidance does not include the impact of any future financing, investment or disposition activities, beyond what has already been disclosed. Upcoming Conferences and Events CoreSite will participate in Citi’s 2016 Global Property CEO Conference on March 14-15, 2016, at The Diplomat Resort & Spa in Hollywood, Florida. Quarter Ended December 31, 2015 5 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Quarter Ended December 31, 2015 Conference Call Details CoreSite will host a conference call on February 11, 2016, at 12:00 p.m., Eastern Time (10:00 a.m., Mountain Time), to discuss its financial results, current business trends and market conditions. The call can be accessed live over the phone by dialing 877-407-3982 for domestic callers or 201-493-6780 for international callers. A replay will be available shortly after the call and can be accessed by dialing 877-870-5176 for domestic callers or 858-384-5517 for international callers. The passcode for the replay is 13626499. The replay will be available until February 18, 2016. Interested parties may also listen to a simultaneous webcast of the conference call by logging on to CoreSite’s website at www.CoreSite.com and clicking on the “Investors” link. The on-line replay will be available for a limited time beginning immediately following the call. About CoreSite CoreSite Realty Corporation (NYSE: COR) delivers secure, reliable, high-performance data center and interconnection solutions to a growing customer ecosystem across eight key North American markets. More than 900 of the world’s leading enterprises, network operators, cloud providers, and supporting service providers choose CoreSite to connect, protect and optimize their performance-sensitive data, applications and computing workloads. Our scalable, flexible solutions and 350+ dedicated employees consistently deliver unmatched data center options — all of which leads to a best-in-class customer experience and lasting relationships. For more information, visit www.CoreSite.com. CoreSite Investor Relations Contact Greer Aviv | Director of Investor Relations +1 303.405.1012 | +1 303.222.7276 [email protected] Quarter Ended December 31, 2015 6 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Quarter Ended December 31, 2015 Forward Looking Statements This earnings release and accompanying supplemental information may contain forward-looking statements within the meaning of the federal securities laws. Forward-looking statements relate to expectations, beliefs, projections, future plans and strategies, anticipated events or trends and similar expressions concerning matters that are not historical facts. In some cases, you can identify forward-looking statements by the use of forward-looking terminology such as “believes,” “expects,” “may,” “will,” “should,” “seeks,” “approximately,” “intends,” “plans,” “pro forma,” “estimates” or “anticipates” or the negative of these words and phrases or similar words or phrases that are predictions of or indicate future events or trends and that do not relate solely to historical matters. Forward-looking statements involve known and unknown risks, uncertainties, assumptions and contingencies, many of which are beyond CoreSite’s control, that may cause actual results to differ significantly from those expressed in any forward-looking statement. These risks include, without limitation: the geographic concentration of the company’s data centers in certain markets and any adverse developments in local economic conditions or the demand for data center space in these markets; fluctuations in interest rates and increased operating costs; difficulties in identifying properties to acquire and completing acquisitions; significant industry competition; the company’s failure to obtain necessary outside financing; the company’s failure to qualify or maintain its status as a REIT; financial market fluctuations; changes in real estate and zoning laws and increases in real property tax rates; and other factors affecting the real estate industry generally. All forward-looking statements reflect the company’s good faith beliefs, assumptions and expectations, but they are not guarantees of future performance. Furthermore, the company disclaims any obligation to publicly update or revise any forward-looking statement to reflect changes in underlying assumptions or factors, of new information, data or methods, future events or other changes. For a further discussion of these and other factors that could cause the company’s future results to differ materially from any forward-looking statements, see the section entitled “Risk Factors” in the company’s most recent annual report on Form 10-K, and other risks described in documents subsequently filed by the company from time to time with the Securities and Exchange Commission. Quarter Ended December 31, 2015 7 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Company Profile VA2 - Reston, Virginia NY2 CoreSite delivers secure, reliable, high-performance data center and interconnection solutions to a growing customer ecosystem across eight key North American markets. BOSTON BO1 CHICAGO CH1 SILICON VALLEY SV1 SV2 SV3 SV4 SV5 SV6 SV7 DENVER HQ DE1 DE2 NEW YORK NY1 NY2 LOS ANGELES LA1 LA2 N VIRGINIA/DC VA1 DC1 VA2 MIAMI MI1 Quarter Ended December 31, 2015 8 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Company Profile Secure, Reliable and Compliant High-Performance • Six 9s uptime for five consecutive years • Cloud-enabled, network-rich data center campuses • Physical security standards and rigorous internal security training enable regulatory compliance requirements • Over 300 network service providers supported by robust IX services to key public clouds • Operational excellence in security and environmental controls • 20,000+ interconnections • Consistent compliance across all properties • • • SOC 1 & SOC 2 Type 2 reviews ISO 27001 certified Payment Card Industry Data Security Standard compliant Scalable • Enabling enterprise with support ecosystems Best-in-Class Customer Experience • Serving customer requirements from half cabinet to full buildings • 350+ professionals with dedicated industry expertise supporting over 900 customers • Two new data centers on the Santa Clara campus to be delivered in 2016 • Experienced and committed operations and facilities personnel • 17 operating data centers in eight of the largest commercial and data center markets in the United States • Dedicated implementation resources to ensure a seamless onboarding process • Ability to increase occupied data center footprint on land and buildings currently owned, including current space unoccupied, under construction and held for development by 70% 24/7 customer support and remote hands • Quarter Ended December 31, 2015 9 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Summary of Financial Data (in thousands, except per share, NRSF and MRR data) Three Months Ended Year Ended December 31, 2015 September 30, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Summary of Results Operating revenues Data center revenues Net income Net income attributable to common shares Funds from operations (FFO) to shares and units Adjusted funds from operations (AFFO) EBITDA Adjusted EBITDA Per share - diluted: Net income attributable to common shares FFO per common share and OP unit $ 90,919 89,001 17,387 9,342 38,175 30,393 43,814 47,695 $ 86,382 84,435 14,530 6,920 35,264 25,644 41,098 43,698 $ 72,492 70,632 12,306 4,664 28,981 23,143 36,107 36,258 $ 333,292 325,324 56,859 26,368 135,772 107,307 159,822 169,903 $ 272,420 264,578 40,052 14,427 104,461 83,189 126,117 133,281 $ $ 0.32 0.80 $ $ 0.26 0.74 $ $ 0.21 0.61 $ $ 1.03 2.86 $ $ 0.66 2.22 As of December 31, 2015 September 30, 2015 June 30, 2015 March 31, 2015 December 31, 2014 Dividend Activity $ 0.53 82.8% $ 0.42 77.6% $ 0.42 76.1% $ 0.42 79.1% $ 0.42 85.4% Dividends declared per share and OP unit AFFO payout ratio Operating Portfolio Statistics Operating data center properties Stabilized data center NRSF Stabilized data center NRSF occupied Stabilized data center % occupied 17 1,524,406 1,409,332 92.5% 17 1,474,472 1,337,015 90.7% 17 1,449,498 1,303,274 89.9% 17 1,354,235 1,194,994 88.2% 17 1,323,210 1,156,486 87.4% Turn-Key Data Center ("TKD") Same Store Statistics MRR per Cabinet Equivalent TKD NRSF % occupied $ 1,459 87.9% $ 1,441 86.0% $ 1,420 84.9% $ 1,408 83.1% $ 1,413 80.2% Market Capitalization, Principal Debt & Preferred Stock $ 3,201,961 392,250 507,250 $ 2,918,547 360,250 475,250 $ 2,620,743 352,250 467,250 $ 2,755,403 333,750 448,750 $ 2,273,458 318,500 433,500 Total enterprise value Total principal debt outstanding Total principal debt and preferred stock outstanding Net Principal Debt to: Annualized Adjusted EBITDA Enterprise Value Net Principal Debt & Preferred Stock to: 2.0x 12.0% 2.0x 12.0% 2.1x 13.2% 2.1x 11.7% 2.1x 13.5% 2.6x 15.6% 2.7x 16.0% 2.8x 17.5% 2.9x 15.8% 2.9x 18.6% Annualized Adjusted EBITDA Enterprise Value Quarter Ended December 31, 2015 10 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Consolidated Balance Sheets (in thousands) December 31, 2015 December 31, 2014 Assets: Investments in real estate: Land Buildings and improvements $ 74,819 1,037,127 $ 78,983 888,966 1,111,946 (284,219) 967,949 (215,978) Less: Ac c umulated deprec iation and amortization Net investment in operating properties Construc tion in progress 827,727 183,189 751,971 178,599 Net investments in real estate 1,010,916 930,570 Cash and c ash equivalents Accounts and other receivables, net Lease intangibles, net Goodwill Other assets, net 6,854 12,235 4,714 41,191 86,633 10,662 10,290 7,112 41,191 74,779 Total assets $ 1,162,543 $ 1,074,604 Liabilities and equity: Liabilities Debt, net Accounts payable and acc rued expenses Ac c rued dividends and distributions Deferred rent payable Ac quired below-market lease c ontrac ts, net Unearned revenue, prepaid rent and other liabilities $ 391,007 75,783 28,104 7,934 4,693 28,717 $ 317,679 42,463 22,355 8,985 5,576 19,205 Total liabilities 536,238 416,263 Stockholders' equity Series A c umulative preferred stoc k Common stoc k, par value $0.01 Additional paid-in c apital Ac c umulated other c omprehensive loss Distributions in exc ess of net inc ome 115,000 301 390,200 (493) (88,891) 115,000 212 275,038 (125) (67,538) Total stoc kholders' equity Nonc ontrolling interests 416,117 210,188 322,587 335,754 Total equity 626,305 658,341 Total liabilities and equity $ 1,162,543 $ 1,074,604 Quarter Ended December 31, 2015 11 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Consolidated Statements of Operations (in thousands, except share and per share data) Three Months Ended Year Ended December 31, 2015 September 30, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Operating revenues: Data c enter revenue: Rental revenue Power revenue Interc onnec tion revenue Tenant reimbursement and other $ 50,018 24,713 12,024 2,246 $ 47,135 23,543 11,400 2,357 $ 39,142 19,963 9,536 1,991 $ 183,300 89,495 44,234 8,295 $ 149,294 71,227 35,355 8,702 Total data c enter revenue Offic e, light-industrial and other revenue 89,001 1,918 84,435 1,947 70,632 1,860 325,324 7,968 264,578 7,842 Total operating revenues 90,919 86,382 72,492 333,292 272,420 Operating expenses: Property operating and maintenanc e Real estate taxes and insuranc e Deprec iation and amortization Sales and marketing General and administrative Rent Impairment of internal-use software Transaction costs 23,840 3,723 24,493 4,117 9,718 5,385 322 - 24,203 3,216 24,347 3,775 8,644 5,440 - 6 20,253 2,519 22,422 3,413 6,260 5,148 - - 89,805 12,144 95,702 15,930 34,179 21,075 322 51 75,119 7,578 80,722 14,554 27,842 20,397 1,959 62 Total operating expenses 71,598 69,631 60,015 269,208 228,233 Operating income 19,321 16,751 12,477 64,084 44,187 Gain on real estate disposal Interest inc ome Interest expense - - 1,208 1 (1,362) 36 6 (7,104) 1,208 6 (5,311) 1 (1,921) 1 (2,188) Inc ome before inc ome taxes Inc ome tax expense 17,401 (14) 14,564 (34) 12,324 (18) 57,022 (163) 40,090 (38) Net inc ome 17,387 14,530 12,306 56,859 40,052 Net inc ome attributable to nonc ontrolling interests 5,870 5,526 5,557 22,063 17,287 Net inc ome attributable to CoreSite Realty Corporation Preferred stoc k dividends 11,517 (2,085) 9,004 (2,084) 6,749 (2,085) 34,796 (8,338) 22,765 (8,338) Net inc ome attributable to c ommon shares $ 9,432 $ 6,920 $ 4,664 $ 26,458 $ 14,427 Net inc ome per share attributable to c ommon shares: Basic Diluted $ $ 0.33 0.32 $ $ 0.26 0.26 $ $ 0.22 0.21 $ $ 1.05 1.03 $ $ 0.68 0.66 Weighted average c ommon shares outstanding: Basic Diluted 28,747,900 29,183,879 26,126,332 26,549,537 21,303,795 21,794,138 25,218,500 25,706,568 21,161,614 21,740,707 Quarter Ended December 31, 2015 12 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 5,960 11,427 9,342 $0.32 22,153 34,706 26,368

Reconciliations of Net Income to FFO, EBITDA and Adjusted EBITDA AFFO, (in thousands, except per share data) Reconciliation of Net Income to FFO Three Months Ended Year Ended December 31, 2015 September 30, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Net inc ome Real estate deprec iation and amortization Gain on real estate disposal $ 17,387 22,873 - $ 14,530 22,818 - $ 12,306 19,968 (1,208) $ 56,859 87,287 (36) $ 40,052 73,955 (1,208) FFO Preferred stoc k dividends $ 40,260 (2,085) $ 37,348 (2,084) $ 31,066 (2,085) $ 144,110 (8,338) $ 112,799 (8,338) FFO available to c ommon shareholders and OP unit holders $ 38,175 $ 35,264 $ 28,981 $ 135,772 $ 104,461 Weighted average c ommon shares outstanding - diluted Weighted average OP units outstanding - diluted 29,184 18,295 26,550 20,861 21,794 25,361 25,707 21,694 21,741 25,361 Total weighted average shares and units outstanding - diluted 47,479 47,411 47,155 47,401 47,102 FFO per c ommon share and OP unit - diluted $ 0.80 $ 0.74 $ 0.61 $ 2.86 $ 2.22 Reconciliation of FFO to AFFO Three Months Ended Year Ended December 31, 2015 September 30, 2015 December 31, 2014 December 31, 2015 December 31, 2014 FFO available to c ommon shareholders and unit holders $ 38,175 $ 35,264 $ 28,981 $ 135,772 $ 104,461 Adjustments: Amortization of deferred financ ing c osts Non-c ash c ompensation Non-real estate deprec iation Straight-line rent adjustment Amortization of above and below market leases Impairment of internal-use software Recurring capital expenditures Tenant improvements Capitalized leasing c osts 247 1,809 1,620 (2,905) (133) 322 (2,328) (1,866) (4,548) 413 1,944 1,529 (2,993) (129) - (667) (1,692) (8,025) 420 1,359 2,454 (1,390) (118) - (254) (1,059) (7,250) 1,246 7,114 8,415 (9,717) (520) 322 (5,828) (8,037) (21,460) 1,897 6,125 6,767 (4,913) (556) 1,959 (4,429) (4,512) (23,610) AFFO available to c ommon shareholders and OP unit holders $ 30,393 $ 25,644 $ 23,143 $ 107,307 $ 83,189 Reconciliation of Net Income to EBITDA and Adjusted EBITDA Three Months Ended Year Ended December 31, 2015 September 30, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Net inc ome Adjustments: Interest expense, net of interest inc ome Inc ome taxes Deprec iation and amortization $ 17,387 $ 14,530 $ 12,306 $ 56,859 $ 40,052 1,920 14 24,493 2,187 34 24,347 1,361 18 22,422 7,098 163 95,702 5,305 38 80,722 EBITDA Non-c ash c ompensation Gain on real estate disposal Transac tion c osts / litigation Impairment of internal-use software $ 43,814 1,809 - 1,750 322 $ 41,098 1,944 - 656 - $ 36,107 1,359 (1,208) - - $ 159,822 7,114 (36) 2,681 322 $ 126,117 6,125 (1,208) 288 1,959 Adjusted EBITDA $ 47,695 $ 43,698 $ 36,258 $ 169,903 $ 133,281 Quarter Ended December 31, 2015 13 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Operating Properties Data Center Operating NRSF Stabilized Pre-Stabilized Total Annualized Rent Held for NRSF Under Development Percent Percent To tal Occupied(2) Percent Market/Facilitie s ($000)(1) Total Occupied(2) To tal Occupied(2) Construction NRSF To tal NRSF San Francisco Bay SV1 SV2 Santa Clara c ampus(3 ) San Francisco Bay Total Los Angeles One Wilshire campus LA1* LA2 Los Angeles Total Northern Virginia VA1 VA2 DC1* Northern Virginia Total Boston BO1 Chicago CH1 New York NY1* NY2 New York Total Miami MI1 Denver DE1* DE2* Denver Total $ 6,760 8,086 32,985 85,932 76,676 252,009 84.9 % 95.8 97.3 - - - - % - - 85,932 76,676 252,009 84.9 % 95.8 97.3 - - 216,580 - - 150,000 85,932 76,676 618,589 47,831 414,617 94.4 - - 414,617 94.4 216,580 150,000 781,197 26,981 139,053 88.2 - - 139,053 88.2 - - 139,053 23,455 203,131 90.0 51,212 63.4 254,343 84.6 43,345 127,202 424,890 50,436 342,184 89.3 51,212 63.4 393,396 85.9 43,345 127,202 563,943 - 28,922 6,149 201,719 69,010 92.5 100.0 - 23,163 - 80.0 201,719 92,173 92.5 95.0 - 96,274 - - 201,719 188,447 3,244 22,137 89.4 - - 22,137 89.4 - - 22,137 38,315 292,866 94.0 23,163 80.0 316,029 93.0 96,274 - 412,303 14,959 166,026 97.6 - - 166,026 97.6 14,031 73,619 253,676 - 16,199 166,776 91.8 11,631 80.2 178,407 91.1 - - 178,407 5,892 48,404 77.3 - - 48,404 77.3 - - 48,404 6,900 52,339 94.9 49,404 40.4 101,743 68.5 - 134,508 236,251 12,792 100,743 86.4 49,404 40.4 150,147 71.3 - 134,508 284,655 1,860 30,176 82.2 - - 30,176 82.2 - 13,154 43,330 - 1,134 5,878 93.0 - - 5,878 93.0 - - 5,878 384 5,140 86.6 - - 5,140 86.6 - - 5,140 1,518 11,018 90.0 - - 11,018 90.0 - - 11,018 Total Data Center Facilities $ 183,910 1,524,406 92.5 % 135,410 59.3 % 1,659,816 89.7 % 370,230 498,483 2,528,529 Offic e & Light-Industrial 7,180 354,721 72.6 - - 354,721 72.6 - - 354,721 59.3 % 86.7 % Total Portfolio $ 191,090 1,879,127 88.7 % 135,410 2,014,537 370,230 498,483 2,883,250 * Indic ates properties in whic h we hold a leasehold interest. (1) On a gross basis, our total portfolio annualized rent was approximately $196.6 million as of Dec ember 31, 2015, whic h reflec ts the addition of $5.5 million in operating expense reimbursements to c ontrac tual net rent under modified gross and triple-net leases. (2) Inc ludes c ustomer leases that have c ommenc ed and are oc c upied as of Dec ember 31, 2015. If all leases signed during the c urrent and prior periods had c ommenc ed, the perc ent oc c upied would have been as follows: Percent Leased Stabilized Pre-Stabilized Total Total Data Center Facilities 93.4% 61.3% 90.7% Total Portfolio 89.5% 61.3% 87.6% (3) The annualized rent for the Santa Clara c ampus inc ludes amounts assoc iated with a restruc tured lease agreement involving a c ustomer that has vac ated its leased spac e and is paying disc ounted rent payments that may be applied to new lease arrangements elsewhere in our portfolio on a dollar-for-dollar basis until the original lease terms expire. The amounts payable pursuant to this agreement are sc heduled to expire as follows: $1.9 million in Q2 2016 and $4.2 million in Q2 2017. See Appendix for definitions. Quarter Ended December 31, 2015 14 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Leasing Statistics Data Center Leasing Activity GAAP Number Annualized GAAP Annualized Rent per Leased NRSF Leasing Activity Total Leased NRSF Rental Churn Rate Cash Rent Growth GAAP Rent Growth of Rent Period Leases(1) (000's) (2) New/expansion leases commenced YTD 2015 Q4 2015 Q3 2015 Q2 2015 Q1 2015 Q4 2014 YTD 2015 Q4 2015 Q3 2015 Q2 2015 Q1 2015 Q4 2014 YTD 2015 Q4 2015 Q3 2015 Q2 2015 Q1 2015 Q4 2014 509 142 150 107 110 106 526 155 149 122 100 96 633 211 165 135 122 78 $ 42,926 9,335 9,250 15,117 9,224 4,943 46,211 8,901 8,825 19,624 8,861 11,075 34,288 10,089 10,460 6,517 7,222 6,705 304,328 54,329 66,330 122,872 60,797 34,009 404,038 42,089 64,087 243,477 54,385 91,662 197,310 49,561 72,031 35,272 40,446 43,863 $ 141 172 139 123 152 145 114 211 138 81 163 121 174 204 145 185 179 153 (2) New/expansion leases signed $ $ (3) (3) (2) Renewal leases signed $ $ 7.5% 2.3% 1.4% 1.6% 2.2% 1.4% 4.6% 3.8% 4.2% 5.7% 5.3% 2.6% 9.1% 6.7% 9.7% 9.1% 11.4% 5.2% (1) Number of leases represents each agreement with a customer; a lease agreement could include multiple spaces and a customer could have multiple leases. During Q4 2014, we signed a 44,036 NRSF lease with a single customer for the entire VA2 Phase 1 facility. The lease commenced during Q2 2015. During Q2 2015, we signed a 136,580 NRSF build-to-suit powered shell lease at our SV6 facility which is currently under development. (2) (3) MRR per Cabinet Equivalent (TKD Same Store) $1,500 $1,450 $1,413 $1,408 y-o-y $1,400 y-o-y $1,350 $1,300 Q4'14 Q1'15 Q2'15 Q3'15 Q4'15 Quarter Ended December 31, 2015 15 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX $1,459 $1,441 3.2% $1,4203.7%y-o-y 4.1% 5.2%5.1%y-o-y y-o-y

Leasing Statistics Lease Distribution (total portfolio, including total data center and office and light-industrial “OLI”) Total Operating NRSF of Leases Percentage of Total Operating NRSF Percentage of Total Annualized Rent Number of Leases Percentage of All Leases Annualized Rent ($000) NRSF Under Lease Unoccupied data center Unoccupied OLI Data c enter NRSF: 5,000 or less 5,001 - 10,000 10,001 - 25,000 Greater than 25,000 Powered shell and other(1 ) OLI Portfolio Total - - - - % 170,205 97,107 8.4 % 4.8 $ - - - % 1,659 31 20 3 16 101 90.6 1.7 1.1 0.2 0.9 5.5 590,448 205,753 290,286 105,532 297,592 257,614 29.4 10.2 14.4 5.2 14.8 12.8 93,553 26,080 36,444 11,239 16,594 7,180 49.0 13.6 19.0 5.9 8.7 3.8 1,830 100.0 % 2,014,537 100.0 % $ 191,090 100.0 % (1) The annualized rent for powered shell and other inc ludes $6.1 million assoc iated with a restruc tured lease agreement involving a c ustomer at the Santa Clara c ampus that has vac ated its leased spac e and is paying disc ounted rent payments that may be applied to new lease arrangements elsewhere in our portfolio on a dollar-for-dollar basis until the original lease terms expire. The amounts payable pursuant to this agreement are sc heduled to expire as follows: $1.9 million in Q2 2016 and $4.2 million in Q2 2017. Lease Expirations (total portfolio, including total data center and office and light-industrial “OLI”) Total Operating NRSF of Expiring Leases Annualized Rent Per Leased NRSF at Expiration(2) Number of Leases Expiring(1) Percentage of Total Operating NRSF Percentage of Total Annualized Rent Annualized Rent Per Leased NRSF(2) Annualized Rent at Expiration ($000)(3) Annualized Rent ($000) Year of Lease Expiration Unoc c upied data c enter Unoc c upied OLI 2016 2017 2018 2019 2020 2021-Thereafter OLI (4 ) Portfolio Total / Weighted Average - - 741 537 291 80 37 43 101 170,205 97,107 322,416 281,288 295,395 183,969 100,112 306,431 257,614 8.4 % 4.8 16.0 14.0 14.7 9.1 5.0 15.2 12.8 $ - - 45,588 50,262 40,057 16,384 8,641 22,978 7,180 - % - 23.8 26.3 21.0 8.6 4.5 12.0 3.8 $ - - 136 164 136 89 86 75 28 $ - - 45,915 52,345 46,200 19,430 12,285 31,506 7,555 $ - - 137 171 156 106 123 103 29 1,830 2,014,537 100.0 % $ 191,090 100.0 % $ 106 $ 215,236 $ 120 (1) Includes leases that upon expiration w ill automatically be renew ed, primarily on a year-to-year basis. Number of leases represents each agreement w ith a customer; a lease agreement could include multiple spaces and a customer could have multiple leases. (2) The annualized rent per leased NRSF and per leased NRSF at expiration does not include annualized rent of $6.1 million associated w ith a restructured lease agreement involving a customer at the Santa Clara campus that has vacated its leased space and is paying discounted rent payments that may be applied to new lease arrangements elsew here in our portfolio on a dollar-for-dollar basis until the original lease terms expire. The amounts payable pursuant to this agreement are scheduled to expire as follow s: $1.9 million in Q2 2016 and $4.2 million in Q2 2017. (3) Represents the final monthly contractual rent under existing customer leases as of December 31, 2015, multiplied by 12. This amount reflects total annualized base rent before any one-time or non-recurring rent abatements and excludes operating expense reimbursement, pow er revenue and interconnection revenue. (4) The office and light-industrial leases are scheduled to expire as follow s: NRSF of Expiring Leases Annualized Rent ($000) Year 2016 2017 2018 2019 2020 2021-Thereafter 39,357 13,882 12,598 31,640 4,937 155,200 $ 989 365 423 798 166 4,439 Total OLI 257,614 $ 7,180 Quarter Ended December 31, 2015 16 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Geographic and Vertical Diversification Geographic Diversification Miami 1.0% Denver 0.8% New York 7.0% Percentage of Total Data Center Annualized Rent Metropolitan Market Boston 8.2% Los Angeles San Franc isc o Bay Northern Virginia Chic ago Boston New York Miami Denver 27.4 26.0 20.8 8.8 8.2 7.0 1.0 0.8 % Los Angeles 27.4% Chicago 8.8% San Francisco Bay 26.0% Northern Virginia 20.8% Total 100.0 % Vertical Diversification Percentage of Total Data Center Annualized Rent Vertical Enterprise: Digital Content & Multimedia SI & MSP Other Enterprise Cloud 23.2% Digital Content & Multimedia 26.4% 26.4 % 13.1 14.0 Total Enterprise Networks & Mobility Cloud 53.5 23.2 23.3 Networks & Mobility 23.1% SI & MSP 13.1% Total 100.0 % Other Enterprise 14.2% Quarter Ended December 31, 2015 17 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 23.2% 23.3% 14.0%

10 Largest Customers 10 Largest Customers (total portfolio, including data center and office and light-industrial) Weighted Average Remaining Lease Term in Months(3) Percentage of Total Operating NRSF(1) Percentage of Total Annualized Rent(2) Number of Locations Total Occupied NRSF Annualized Rent ($000) Customer Industry CoreSite Vertical 1 2 3 4 5 6 7 8 9 10 Technology Technology Technology(4 ) Technology Technology Technology Technology Technology Government* Technology Cloud Enterprise - SI & MSP Enterprise - Digital Content Enterprise - Digital Content Cloud Network Enterprise - SI & MSP Cloud Enterprise - Other Enterprise - Digital Content 9 3 10 2 2 5 2 1 1 6 146,118 63,348 71,555 31,974 70,630 28,078 20,032 28,923 130,960 36,634 7.3 % $ 3.1 3.6 1.6 3.5 1.4 1.0 1.4 6.5 1.8 10,238 8,743 6,404 5,504 4,514 4,254 4,246 4,230 3,895 3,354 5.4 % 4.6 3.3 2.9 2.4 2.2 2.2 2.2 2.0 1.8 48 37 5 28 77 40 18 34 85 40 Total/Weighted Average(5) 628,252 31.2 % $ 55,382 29.0 % 40 * Denotes customer using space for general office purposes. (1) Represents the customer’s total occupied square feet divided by the total operating NRSF in the portfolio w hich, as of December 31, 2015, consisted of 2,014,537 NRSF. (2) Represents the customer’s total annualized rent divided by the total annualized rent in the portfolio as of December 31, 2015, w hich w as approximately $191.1 million. (3) W eighted average based on percentage of total annualized rent expiring calculated as of December 31, 2015. (4) W e are currently negotiating renew al leases w ith this customer at all locations. W e anticipate that the lease negotiations w ill be finalized at some of the locations during 2016 and that other locations w ill be vacated. (5) In addition to the ten largest customers, total annualized rent includes $6.1 million associated w ith a restructured lease agreement involving a customer at the Santa Clara campus that has vacated its leased space and is paying discounted rent payments that may be applied to new lease arrangements elsew here in our portfolio on a dollar-for-dollar basis until the original lease terms expire. Quarter Ended December 31, 2015 18 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Capital Expenditures and Completed Pre-Stabilized Projects (in thousands, except NRSF and cost per NRSF data) Capital Expenditures and Repairs and Maintenance Three Months Ended December 31, 2015 September 30, 2015 June 30, 2015 March 31, 2015 December 31, 2014 Data center expansion(1) Non-recurring investments(2) Tenant improvements Recurring capital expenditures(3) $ 64,816 1,968 1,866 2,328 $ 25,762 1,263 1,692 667 $ 21,130 2,868 2,282 852 $ 21,078 3,872 2,197 1,981 $ 19,147 1,838 1,059 254 Total capital expenditures $ 70,978 $ 29,384 $ 27,132 $ 29,128 $ 22,298 Repairs and maintenance expense(4) $ 2,715 $ 3,011 $ 2,485 $ 2,349 $ 2,485 (1) Data center expansion capital expenditures include new data center construction, development projects adding capacity to existing data centers and other revenue generating investments. Data center expansion also includes investment of Deferred Expansion Capital, as defined in the Appendix. Non-recurring investments include upgrades to existing data center or office space and company-w ide improvements that are ancillary to revenue generation such as internal system development and system-w ide security upgrades, w hich have a future economic benefit. Recurring capital expenditures include required equipment upgrades w ithin our operating portfolio, w hich have a future economic benefit. Repairs and maintenance expense is classified w ithin property operating and maintenance expense in the consolidated statement of operations. These expenditures represent recurring maintenance contracts and repairs to operating equipment necessary to maintain current operations. (2) (3) (4) Completed Pre-Stabilized Projects Percent Leased(2) Metropolitan Market Cost Per NRSF Percent Occupied Cost(1) Projects/Facilities Completion NRSF NY2 Phase 1 LA2 VA2 Phase 2 NY2 Phase 2 LA2 CH1 New York Los Angeles Northern Virginia New York Los Angeles Chic ago Q1 2014 Q1 2014 Q2 2015 Q2 2015 Q3 2015 Q3 2015 16,484 33,711 23,163 32,920 17,501 11,631 $ 14,499 9,800 16,065 29,476 1,558 5,551 $ 880 291 694 895 89 477 73.4 64.4 80.0 23.9 77.3 80.2 % 73.4 % 58.0 80.0 23.9 73.7 80.2 Total completed pre-stabilized 135,410 $ 76,949 $ 568 61.3 % 59.3 % (1) Cost inc ludes c apital expenditures related to the spec ific projec t / phase and, for NY2 and VA2, also inc ludes alloc ations of capital expenditures related to land and building shell that were inc urred during the first phase of eac h overall projec t. (2) Inc ludes c ustomer leases that have been signed as of Dec ember 31, 2015, but have not c ommenc ed. The perc ent leased is determined based on leased square feet as a proportion of total pre-stabilized NRSF. Quarter Ended December 31, 2015 19 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Development Summary (in thousands, except NRSF and cost per NRSF data) Data Center Projects Under Construction Costs Metropolitan Market Estimated Completion Incurred to-date Estimated Total Percent Leased Projects/Facilities NRSF Per NRSF TKD(1) VA2 Phase 3(2 ) VA2 Phase 4(2 ) BO1 SV7 Phase 1 LA2 Northern Virginia Northern Virginia Boston San Franc isc o Bay Los Angeles Q1 2016 Q1 2016 Q1 2016 Q2 2016 Q1 - Q2 2016 48,137 48,137 14,031 80,000 43,345 $ 17,408 4,630 9,363 23,794 7,592 $ 24,500 8,000 11,000 110,000 18,000 $ 509 166 784 1,375 415 48.1 % - - 47.8 - Powered shell SV6(3 ) % San Franc isc o Bay Q1 - Q2 2016 136,580 $ 18,083 $ 30,000 $ 220 100.0 53.5 % Total TKD and powered shell 370,230 $ 80,870 $ 201,500 Deferred expansion capital (4) CH1 LA1 LA2 NY2 SV4 Chic ago Los Angeles Los Angeles New York San Franc isc o Bay Q1 2016 Q1 2016 Q1 2016 Q1 2016 Q1 2016 - - - - - $ 1,042 1,273 924 1,363 740 $ 2,600 1,300 1,100 3,500 1,000 Total deferred expansion capital  - $ 5,342 $ 9,500 Total 370,230 $ 86,212 $ 211,000 (1) TKD estimated development costs includes two components: 1) general construction to ready the NRSF as data center space and 2) power, cooling and other infrastructure to provide the designed amount of power capacity for the project. Following development completion, incremental capital, referred to as Deferred Expansion Capital, may be invested to support existing or anticipated future customer utilization of NRSF within our operating data centers.  The estimated total c osts for VA2 phases 3 and 4 is $338 per NRSF. Represents 136,580 NRSF of build-to-suit spac e that was 100% pre-leased in April 2015 and has an expec ted lease c ommenc ement date in the first half of 2016. See Appendix for Deferred Expansion Capital definition. (2) (3) (4) Quarter Ended December 31, 2015 20 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Development Summary (in thousands, except NRSF, cost per NRSF and power data) Held for Development Estimated Sellable Power (Megawatts) Estimated Incremental Cost per MW Metropolitan Market Estimated Incremental Costs Project / Building Estimated NRSF New construction(1) SV7 San Franc isc o Bay 150,000 $ 70,000 15.0 $ 4,667 Incremental capacity in existing core and shell buildings(2) NY2 (Phases 3-4) NY2 Phase 5 BO1 LA2 MI1 New York New York Boston Los Angeles Miami 87,297 47,211 73,619 127,202 13,154 57,000 35,000 40,000 55,000 7,500 8.5 5.0 6.0 9.0 1.0 6,706 7,000 6,667 6,111 7,500 Total new construction and incremental capacity 498,483 $ 264,500 36.0 $ 38,650 Deferred expansion c apital(3 ) - 35,000 Total(4) 498,483 $ 299,500 (1) New c onstruc tion represents data c enter ground up c onstruc tion. For ground up c onstruc tion, we will develop the c ore and shell of the data c enter along with the first phase of leasable spac e. Future phases will be delivered based upon c ustomer demand. Represents inc remental data c enter c apac ity that may be c onstruc ted within existing fac ilities when the c ore and shell building have been developed and c ertain amounts of the existing spac e is not yet built out into data c enter spac e. As we construct data center capacity, we work to optimize both the amount of the capital we deploy on power and cooling infrastructure and the timing of that capital deployment; as such, we generally construct our power and cooling infrastructure supporting our data center NRSF based on our estimate of customer utilization. This practice can result in our investment at a later time in Deferred Expansion Capital. We define Deferred Expansion Capital as our estimate of the incremental capital we may invest in the future to add power or cooling infrastructure to support existing or anticipated future customer utilization of NRSF within our operating data centers. From time to time, we may revise our estimate of Deferred Expansion Capital as well as the potential time period during which we may invest it. We estimate a range of $30 - $40 million of future capital investment. In addition to new c onstruc tion and inc remental c apac ity in existing c ore and shell buildings, we have available ac reage whic h represents entitled and unentitled land we own adjac ent to our existing buildings, in the form of existing parking lots. By utilizing existing parking lots, we believe we c an build approximately 100,000 NRSF and 200,000 NRSF buildings on our available ac reage at NY2 and LA2, respec tively. (2) (3) (4) Quarter Ended December 31, 2015 21 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Market Capitalization and Debt Summary (in thousands, except per share data) Market Capitalization Shares or Equivalents Outstanding Market Price / Liquidation Value as of December 31, 2015 Market Value Equivalents Common shares Operating partnership units Liquidation value of preferred stock Total equity Total principal debt outstanding Total enterprise value 30,651 16,858 4,600 $56.72 $56.72 $25.00 $ 1,738,525 956,186 115,000 2,809,711 392,250 $ 3,201,961 Net debt to enterprise value Net debt and preferred stock to enterprise value 12.0% 15.6% Debt Summary (1) Maturity Date with Extension Outstanding as of: December 31, 2015 Maturity Date December 31, 2014 Instrument Rate Revolving credit facility (2) 2019 Senior unsecured term loan (3) 2020 Senior unsecured term loan (4) Total principal debt outstanding Unamortized deferred financing costs Total debt W eighted average interest rate Preferred stock Total debt and preferred stock Floating rate vs. fixed rate debt Floating rate vs. fixed rate debt and preferred stock 1.79% 3.23% 2.34% 6/24/2019 1/31/2019 6/24/2020 6/24/2020 1/31/2019 6/24/2020 $ 142,250 100,000 150,000 $ 218,500 100,000 - 392,250 (1,243) 318,500 (821) $ 391,007 $ 317,679 2.37% 7.25% N/A N/A $ 115,000 $ 115,000 $ 506,007 $ 432,679 55% / 45% 43% / 57% 69% / 31% 50% / 50% (1) See the most recently filed Form 10-K and 10-Q for information on specific debt instruments including our February 2, 2016, partial exercise of the accordion feature under the senior unsecured credit facility resulting in a new five-year $100 million term loan. The revolving credit facility interest rate is based on 1-month LIBOR at December 31, 2015, plus applicable spread. Represents the effective interest rate as a result of the interest rate swap associated with $100 million in 1-month LIBOR variable rate debt. Represents the effective interest rate as a result of the interest rate swap associated with $75 million in 1-month LIBOR variable rate debt and $75 million unhedged debt based on 1-month LIBOR plus applicable spread. (2) (3) (4) Debt Maturities Quarter Ended December 31, 2015 22 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 1.98% 2.43% 2.47%

Interest Summary and Debt Covenants (in thousands) Interest Expense Components Three Months Ended Year Ended December 31, 2015 September 30, 2015 December 31, 2014 December 31, 2015 December 31, 2014 Interest expense and fees Amortization of deferred financ ing c osts Capitalized interest Total interest expense Perc ent c apitalized $ 2,473 247 (799) $ 2,392 413 (617) $ 2,183 420 (1,241) $ 9,556 1,246 (3,698) $ 8,047 1,897 (4,633) $ 1,921 $ 2,188 $ 1,362 $ 7,104 $ 5,311 29.4% 22.0% 47.7% 34.2% 46.6% Debt Covenants Revolving Credit Facility and Senior Unsecured Term Loans December 31, September 30, June 30, 2015 March 31, 2015 December 31, 2014 Required Compliance 2015 2015 Fixed c harge c overage ratio Total indebtedness to gross asset value Sec ured debt to gross asset value Unhedged variable rate debt to gross asset value Greater than 1.70x Less than 60% Less than 40% 10.1x 16.7% 0.0% 9.3x 17.5% 0.0% 8.4x 17.9% 0.0% 8.8x 17.1% 0.0% 8.4x 17.2% 0.0% Less than 30% 8.9% 8.4% 8.3% 11.8% 11.6% Revolving c redit fac ility availability Borrowings outstanding Outstanding letters of c redit Current availability $350,000 (142,250) (6,330) $350,000 (110,250) (6,330) $350,000 (102,250) (6,330) $405,000 (233,750) (7,330) $405,000 (218,500) (7,330) $201,420 $233,420 $241,420 $163,920 $179,170 Quarter Ended December 31, 2015 23 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Components of Net Asset Value (NAV) (in thousands) Cash Net Operating Income Reconciliation of Net Operating Income (NOI) Operating Inc ome Adjustments: Deprec iation and amortization General and administrative (inc ludes litigation) Net Operating Inc ome Q4 2015 Annualized $ 19,321 $ 77,284 24,493 9,718 97,972 38,872 $ 53,532 $ 214,128 Cash Net Operating Income (Cash NOI) Net Operating Inc ome Adjustments: Straight-line rent Amortization of above and below-market leases Cash NOI $ 53,532 $ 214,128 (2,905) (133) (11,620) (532) $ 50,494 $ 201,976 Cash NOI with bac klog (87.6% leased)(1 ) Cash stabilized NOI (93% leased) $ $ 53,486 56,783 $ $ 213,944 227,132 Development Projects Data Center Projects Under Construction TKD and powered shell c onstruc tion in progress(2 ) Remaining spend(2 ) Total $ 80,870 120,630 $ 201,500 Targeted annual yields Annualized pro forma NOI range 12% - 16% $24,200 - $32,200 Deferred expansion c apital in progress Remaining spend(3 ) Total $ 5,342 4,158 $ 9,500 Other Assets and Liabilities Other Assets Remaining c onstruc tion in progress(4 ) Cash and c ash equivalents Ac c ounts and other rec eivables Other tangible assets Total other assets $ 96,977 6,854 12,235 20,458 $ 136,524 Liabilities Debt Ac c ounts payable, ac c rued and other liabilities Ac c rued dividends and distributions Preferred equity Total liabilities $ 391,007 104,500 28,104 115,000 $ 638,611 Weighted average common shares and units - diluted 47,479 Cash NOI with bac klog is adjusted to inc lude one quarter of the c ash bac klog as of Dec ember 31, 2015, less any leasing of c urrently oc c upied NRSF and data c enter projec ts under development. Does not inc lude spend assoc iated with leasing c ommissions. See page 19 for further breakdown of data c enter projec ts under c onstruc tion. Does not inc lude spend assoc iated with an estimated $30 - $40 million of future deferred expansion c apital investment. Represents the book value of in progress c apital projec ts, inc luding land and shell building, of future data c enter expansion, non-rec urring investments, tenant improvements and rec urring c apital expenditures. (1) (2) (3) (4) Quarter Ended December 31, 2015 24 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

2016 Guidance (in thousands, except per share amounts) The annual guidanc e provided below represents forward-looking projec tions, whic h are based on c urrent ec onomic c onditions, internal assumptions about our existing c ustomer base and the supply and demand dynamic s of the markets in whic h we operate. Further, the guidanc e does not inc lude the impac t of any future financ ing, investment or disposition ac tivities. Please refer to the press release for additional information on forward-looking statements. Projected per share and OP unit information: 2016 Implied Growth(1) 15% 19% 16% 5% 17% (1) Implied growth is based on the midpoint of 2016 guidanc e. Quarter Ended December 31, 2015 25 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Net inc ome attributable to c ommon shares Real estate deprec iation and amortization FFO Projected operating results: Total operating revenues General and administrative expenses Adjusted EBITDA(3 ) Guidance drivers: Annual rental c hurn rate Cash rent growth on data c enter renewals Capital expenditures: Data c enter expansion Non-rec urring investments Tenant improvements Rec urring c apital expenditures Low High Mid 2015 $ 1.03 1.83 $ 1.13 $ 1.23 $ 1.18 2.24 2.24 2.24 $ 3.37 $ 3.47 $ 3.42 $ 380,000 $ 396,000 $ 388,000 35,000 37,000 36,000 196,000 202,000 199,000 6.0% 8.0% 7.0% 3.0% 5.0% 4.0% $ 185,000 $ 200,000 $ 192,500 15,000 20,000 17,500 5,000 10,000 7,500 5,000 10,000 7,500 $ 2.86 $ 333,292 34,179 169,903 7.5% 4.6% $ 132,786 9,971 8,037 5,828 $156,622 Total capital expenditures $210,000 $240,000 $225,000 15.0% 19.6% 16.4% 5.3% 17.1%

Appendix Definitions This document includes certain non-GAAP financial measures that management believes are helpful in understanding our business, as further described below. Our definition and calculation of non-GAAP financial measures may differ from those of other REITs and therefore may not be comparable. The non-GAAP measures should not be considered an alternative to net income as an indicator of our performance and should be considered only a supplement to net income, cash flows from operating, investing or financing activities as a measure of profitability and/or liquidity, computed in accordance with GAAP. Funds From Operations (“FFO”) is a supplemental measure of our performance which should be considered along with, but not as an alternative to, net income and cash provided by operating activities as a measure of operating performance and liquidity. We calculate FFO in accordance with the standards established by the National Association of Real Estate Investment Trusts (“NAREIT”). FFO represents net income (loss) (computed in accordance with GAAP), excluding gains (or losses) from sales of property and undepreciated land and impairment write-downs of depreciable real estate, plus real estate related depreciation and amortization (excluding amortization of deferred financing costs) and after adjustments for unconsolidated partnerships and joint ventures. FFO attributable to common shares and units represents FFO less preferred stock dividends declared during the period. Our management uses FFO as a supplemental performance measure because, in excluding real estate related depreciation and amortization and gains and losses from property dispositions, it provides a performance measure that, when compared year over year, captures trends in occupancy rates, rental rates and operating costs. We offer this measure because we recognize that FFO will be used by investors as a basis to compare our operating performance with that of other REITs. However, because FFO excludes depreciation and amortization and captures neither the changes in the value of our properties that result from use or market conditions, nor the level of capital expenditures and capitalized leasing commissions necessary to maintain the operating performance of our properties, all of which have real economic effect and could materially impact our financial condition and results from operations, the utility of FFO as a measure of our performance is limited. FFO is a non-GAAP measure and should not be considered a measure of liquidity, an alternative to net income, cash provided by operating activities or any other performance measure determined in accordance with GAAP, nor is it indicative of funds available to fund our cash needs, including our ability to pay dividends or make distributions. In addition, our calculations of FFO are not necessarily comparable to FFO as calculated by other REITs that do not use the same definition or implementation guidelines or interpret the standards differently from us. Investors in our securities should not rely on these measures as a substitute for any GAAP measure, including net income. Quarter Ended December 31, 2015 26 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Appendix Adjusted Funds From Operations “AFFO” is a non-GAAP measure that is used as a supplemental operating measure specifically for comparing year over year ability to fund dividend distribution from operating activities. AFFO is used by us as a basis to address our ability to fund our dividend payments. We calculate adjusted funds from operations by adding to or subtracting from FFO: 1. 2. 3. Plus: Amortization of deferred financing costs Plus: Non-cash compensation Plus: Non-real estate depreciation 4. Plus: Impairment charges 5. 6. 7. Plus: Below market debt amortization Less: Straight line rents adjustment Less: Amortization of above and below market leases 8. 9. Less: Recurring capital expenditures Less: Tenant improvements 10. Less: Capitalized leasing costs Capitalized leasing costs include commissions payable to third party brokers and leasing agents and internal sales commissions payable to employees. Capitalized leasing costs are accrued and deducted from AFFO generally in the period that the lease is executed. Leasing costs are generally paid a) to third party brokers and internal sales employees 50% at customer lease signing and 50% at lease commencement and b) to leasing agents monthly over the lease term as and to the extent the Company receives payment from the end customer. AFFO is not intended to represent cash flow from operations for the period, and is only intended to provide an additional measure of performance by adjusting the effect of certain items noted above included in FFO. AFFO is a widely reported measure by other REITs, however, other REITs may use different methodologies for calculating AFFO and, accordingly, our AFFO may not be comparable to other REITs. Earnings before Interest, Taxes, Depreciation and Amortization (EBITDA) and Adjusted EBITDA - EBITDA is defined as earnings before interest, taxes, depreciation and amortization. We calculate adjusted EBITDA by adding our non-cash compensation expense, transaction costs and litigation expense to EBITDA as well as adjusting for the impact of impairment charges, gains or losses from sales of property and undepreciated land and gains or losses on early extinguishment of debt. Management uses EBITDA and adjusted EBITDA as indicators of our ability to incur and service debt. In addition, we consider EBITDA and adjusted EBITDA to be appropriate supplemental measures of our performance because they eliminate depreciation and interest, which permits investors to view income from operations without the impact of non-cash depreciation or the cost of debt. However, because EBITDA and adjusted EBITDA are calculated before recurring cash charges including interest expense and taxes, and are not adjusted for capital expenditures or other recurring cash requirements of our business, their utilization as a cash flow measurement is limited. Quarter Ended December 31, 2015 27 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Appendix Net Operating Income (“NOI”) and Cash NOI – NOI, and cash NOI are supplemental measures for the operating performance of the company’s portfolio. NOI is operating revenues less operating expenses and adjusted for items such as depreciation and amortization, general and administrative expenses, transaction costs and litigation expenses. Cash NOI is NOI less straight-line rents and above and below market rent amortization. Data Center Net Rentable Square Feet (“NRSF”) Both occupied and available data center NRSF includes a factor based on management’s estimate of space to account for a customer’s proportionate share of required data center support space (such as the mechanical, telecommunications and utility rooms) and building common areas, which may be updated on a periodic basis to reflect the most current build-out of our properties. Deferred Expansion Capital As we construct data center capacity, we work to optimize both the amount of the capital we deploy on power and cooling infrastructure and the timing of that capital deployment; as such, we generally construct our power and cooling infrastructure supporting our data center NRSF based on our estimate of customer utilization. This practice can result in our investment at a later time in Deferred Expansion Capital. We define Deferred Expansion Capital as our estimate of the incremental capital we may invest in the future to add power or cooling infrastructure to support existing or anticipated future customer utilization of NRSF within our operating data centers. From time to time, we may revise our estimate of Deferred Expansion Capital as well as the potential time period during which we may invest it. See the Data Center Projects Under Construction and Held for Development tables on pages 20 and 21, respectively, for more detail. Stabilized and Pre-Stabilized NRSF Data center projects and facilities that recently have been developed and are in the initial lease-up phase are classified as pre-stabilized NRSF until they reach 85% occupancy or have been in service for 24 months. Pre-stabilized projects and facilities become stabilized operating properties at the earlier of achievement of 85% occupancy or 24 months after development completion and are included in the stabilized operating NRSF. Annualized Rent Monthly contractual rent under existing commenced customer leases as of quarter-end, multiplied by 12. This amount reflects total annualized base rent before any one-time or non-recurring rent abatements and excludes power revenue, interconnection revenue and operating expense reimbursement. NRSF Under Construction Represents NRSF for which substantial activities are ongoing to prepare the property for its intended use following development. The NRSF reflects managements estimate of engineering drawings and required support space and is subject to change based on final demising of space. Estimated costs of completion are based on actual costs at quarter-end and management’s estimate of remaining projects costs. Quarter Ended December 31, 2015 28 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX

Appendix NRSF Held for Development Represents incremental data center capacity that may be constructed in existing facilities that requires significant capital investment in order to develop new data center facilities. The data represents management's best estimate of incremental costs that may vary based on estimated NRSF and power design and are subject to market conditions and build-out specifications. Turn-Key Same Store Includes turn-key data center space that was leased or available to be leased to our colocation customers as of December 31, 2013, at each of our properties, and excludes powered shell data center space, SV3 data center space, office and light-industrial space and space for which development was completed and became available to be leased after December 31, 2013. The turn-key same store space as of December 31, 2013, is 1,067,665 NRSF. We track same store on a computer room basis within each data center facility. Monthly Recurring Revenue per Cabinet Equivalent Represents the turn-key monthly recurring colocation revenue (“MRR”) per cabinet equivalent billed. MRR is defined as recurring contractual revenue under existing commenced customer leases. MRR per cabinet equivalent is calculated as (current quarter MRR/3) divided by ((quarter-end cabinet equivalents billed plus prior quarter-end cabinet equivalents billed)/2). Cabinet equivalents are calculated as cage-usable square feet (turn-key leased NRSF/NRSF factor) divided by 25. Data Center Leasing Metrics •Rental Churn Rate – represents data center leases which are not renewed or are terminated during the period. Rental churn is calculated based on the annualized rent of data center expired leases terminated in the period, compared with total portfolio annualized rent at the beginning of the period. •Cash and GAAP Rent Growth – represents the increase in rental rates on renewed data center leases signed during the period, as compared with the previous rental rates for the same space. Cash and GAAP rent growth is calculated based on annualized rent from the renewed data center license compared to annualized rent from the expired data center license. Quarter Ended December 31, 2015 29 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX