Earnings Release and Supplemental Information QUARTER ENDED DECEMBER 31, 2014 ®2015 CoreSite Realty Corporation, All Rights Reserved.

Overview Earnings Release 3 Company Profile 8 Summary of Financial Data 10 Financial Statements Consolidated Balance Sheets 11 Consolidated Statements of Operations 12 Reconciliations of Net Income to FFO, AFFO, EBITDA & Adjusted EBITDA 13 Operating Portfolio Operating Properties 14 Leasing Statistics 15 Geographic & Vertical Diversification 17 10 Largest Customers 18 Development Capital Expenditures & Completed Pre-Stabilized Projects 19 Development Summary 20 Capital Structure Market Capitalization & Debt Summary 21 Interest Summary & Debt Covenants 22 Components of Net Asset Value 23 2015 Guidance 24 Appendix 25 Table of Contents 2 Quarter Ended December 31, 2014

DENVER, CO – FEBRUARY 12, 2015 CoreSite Realty Corporation (NYSE:COR), a premier provider of secure, reliable, high-performance data center solutions across the US, today announced financial results for the fourth quarter ended December 31, 2014. Quarterly Highlights • Reported fourth-quarter funds from operations (“FFO”) of $0.61 per diluted share and unit, representing 24.5% growth year over year • Reported fourth-quarter total operating revenues of $72.5 million, representing an 18.0% increase year over year; data center revenues increased 18.9% year over year • Executed 91,662 net rentable square feet of new and expansion turn-key data center leases representing $11.1 million of annualized GAAP rent at a rate of $121 per square foot • Realized rent growth on signed renewals of 2.6% on a cash basis and 5.2% on a GAAP basis and recorded rental churn of 1.4% • Commenced 34,009 net rentable square feet of new and expansion leases representing $4.9 million of annualized GAAP rent at a rate of $145 per square foot, increasing stabilized data center occupancy to 87.4% • Opened VA2 with 100% of the first phase of turn-key capacity leased to a single anchor tenant whose lease commences in April 2015 • Increased quarterly common stock dividend by 20% to $0.42 per share; annual rate of $1.68 per share Tom Ray, CoreSite’s Chief Executive Officer, commented, “We are pleased to report continued execution of our business plan in the fourth quarter, delivering another quarter of solid revenue and earnings growth and finishing out 2014 as a strong year for CoreSite.” Mr. Ray continued, “We finished 2014 and began 2015 with accelerating momentum, upon which we will continue to execute as we focus on capturing opportunities to grow organically in our existing markets.” Financial Results CoreSite reported FFO attributable to shares and units of $29.0 million for the three months ended December 31, 2014, a 25.5% increase year over year and an increase of 11.9% sequentially. On a per diluted share and unit basis, FFO increased 24.5% to $0.61 for the three months ended December 31, 2014, as compared to $0.49 per diluted share and unit for the three months ended December 31, 2013. On a sequential basis, FFO per diluted share increased 10.9%. Total operating revenues for the three months ended December 31, 2014, were $72.5 million, an 18.0% increase year over year and an increase of 2.8% sequentially. Data center revenues for the three months ended December 31, 2014, were $70.6 million, an 18.9% increase year over year and an increase of 3.1% sequentially. CoreSite reported net income attributable to common shares of $4.7 million, or $0.21 per diluted share. CORESITE REPORTS FOURTH-QUARTER REVENUE AND FFO PER SHARE GROWTH OF 18% AND 25% YEAR OVER YEAR, RESPECTIVELY 3 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Quarter Ended December 31, 2014

Sales Activity CoreSite executed 96 new and expansion turn-key data center leases representing $11.1 million of annualized GAAP rent during the fourth quarter, comprised of 91,662 NRSF at a weighted-average GAAP rate of $121 per NRSF. During the fourth quarter, CoreSite opened VA2 in Reston, Virginia, with the first phase of 44,036 NRSF of turn-key capacity leased to a single anchor tenant. CoreSite’s renewal leases signed in the fourth quarter totaled $6.7 million in annualized GAAP rent, comprised of 43,863 NRSF at a weighted average GAAP rate of $153 per NRSF, reflecting a 2.6% increase in rent on a cash basis and a 5.2% increase on a GAAP basis. The fourth-quarter rental churn rate was 1.4%. CoreSite’s fourth-quarter data center lease commencements totaled 34,009 NRSF at a weighted average GAAP rental rate of $145 per NRSF, which represents $4.9 million of annualized GAAP rent. Development Activity CoreSite had 92,173 NRSF of data center space under construction at VA2 in Reston, Virginia, at the end of the fourth quarter, comprised of Phase 1 and Phase 2 construction. This amount includes 44,036 NRSF associated with Phase 1 that was 100% leased as of December 31, 2014. As of December 31, 2014, CoreSite had incurred $77.5 million of the estimated $89.4 million required to complete these projects at VA2. During the fourth quarter, CoreSite began construction on Phase 2 at NY2, comprising 49,050 NRSF expected to be delivered in the second quarter of 2015. As of December 31, 2014, CoreSite had incurred $2.3 million of the estimated $21.3 million required to complete this project. Additionally, CoreSite had 28,587 NRSF of turn-key data center capacity under construction at three locations as of December 31, 2014, across the Company’s existing facilities at BO1 (Boston), DE1 (Denver), and CH1 (Chicago). As of December 31, 2014, CoreSite had incurred $1.4 million of the estimated $18.0 million required to complete these projects. Balance Sheet and Liquidity As of December 31, 2014, CoreSite had $318.5 million of total long-term debt, correlating to 2.2 times fourth-quarter annualized adjusted EBITDA, and $433.5 million of long-term debt and preferred stock, correlating to 3.0 times fourth-quarter annualized adjusted EBITDA. At quarter end, CoreSite had $10.7 million of cash available on its balance sheet and $179.2 million of capacity available under its revolving credit facility. Quarter Ended December 31, 2014 4 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Quarter Ended December 31, 2014 Quarter Ended December 31, 2014

Dividend On December 8, 2014, CoreSite announced a 20% increase in its quarterly dividend to $0.42 per share of common stock and common stock equivalents for the fourth quarter of 2014. The increased dividend reflects an annualized dividend rate of $1.68 per share, compared to the prior annualized dividend rate of $1.40 per share. The fourth-quarter common stock dividend was paid on January 15, 2015, to shareholders of record on December 31, 2014. CoreSite also announced on December 8, 2014, a dividend of $0.4531 per share of Series A preferred stock for the period October 15, 2014, to January 14, 2015. The preferred dividend was paid on January 15, 2015, to shareholders of record on December 31, 2014. 2015 Guidance CoreSite is introducing its 2015 guidance of FFO per diluted share and unit in the range of $2.55 to $2.65. More detail regarding the assumptions underpinning the 2015 annual guidance can be found on page 24 of the fourth-quarter 2014 earnings supplemental. In addition, the company’s estimate of 2015 net income attributable to common shares is $0.75 to $0.85 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 2015 Global Property CEO Conference on March 2, 2015, at The Diplomat Resort & Spa in Hollywood, Florida. Quarter Ended December 31, 2014 5 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

Conference Call Details CoreSite will host a conference call on February 12, 2015, 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 13598544. The replay will be available until February 19, 2015. 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 solutions across eight key North American markets. More than 800 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 | CoreSite Investor Relations Director +1 303.405.1012 | +1 303.222.7276 Greer.Aviv@CoreSite.com Quarter Ended December 31, 2014 6 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

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, 2014 7 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

Company Profile CoreSite delivers secure, reliable, high-performance data center solutions across eight key North American markets. NY2 SILICON VALLEY SV1 SV3 SV5 SV2 SV4 LOS ANGELES LA1 LA2 DENVER HQ DE1 DE2 CHICAGO CH1 N VIRGINIA/DC VA1 DC1 VA2 BOSTON BO1 MIAMI MI1 NEW YORK NY1 NY2 8 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

Company Profile Secure, Reliable and Compliant Six 9s uptime for four consecutive years Physical security standards enable regulatory compliance requirements Payment Card Industry certification Rigorous internal security training Operational excellence in security and environmental controls Scalable Newest data centers, NY2 and VA2, located in Secaucus, NJ, and Reston, VA 17 operating data centers in eight of the US’ largest commercial and data center markets 2.5+ million gross square feet Ability to nearly double data center footprint on land and buildings currently owned High-Performance Cloud-enabled, network-rich data center campuses Over 275 network service providers supported by robust IX services to key public clouds 15,000+ cross-connects Enabling enterprise with support ecosystems Best-in-Class Customer Experience 350+ professionals with dedicated industry expertise Experienced and committed operations and facility personnel Dedicated implementation resources to ensure a seamless onboarding process 24/7 customer support and remote hands 9 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX VA2 2014 Quarter Ended December 31, 2014

Summary of Financial Data (in thousands, except per share and NRSF data) 10 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Three Months Ended Year Ended Summary of Results December 31, 2014 September 30, 2014 December 31, 2013 December 31, 2014 December 31, 2013Operating revenues $72,492 $70,515 $61,440 $272,420 $234,833Data center revenues 70,632 68,499 59,408 264,578 226,992Net income 12,306 8,990 9,029 40,052 31,612Net income attributable to common shares 4,664 3,147 3,135 14,427 10,503Funds from operations (FFO) to shares and units 28,981 25,894 23,090 104,461 85,314Adjusted funds from operations (AFFO) 23,143 19,111 19,385 83,189 78,061EBITDA 36,107 31,286 26,891 126,117 100,455Adjusted EBITDA 36,258 32,853 28,324 133,281 107,754Per share - diluted: Net income attributable to common shares $0.21 $0.14 $0.15 $0.66 $0.49FFO per common share and OP unit $0.61 $0.55 $0.49 $2.22 $1.82As of December 31, 2014 September 30, 2014 June 30, 2014 March 31, 2014 December 31, 2013Dividend Activity Dividends declared per share and OP unit $0.42 $0.35 $0.35 $0.35 $0.35AFFO payout ratio 85.4% 86.2% 76.2% 84.4% 84.4%Operating Portfolio Statistics Operating data center properties 17 16 16 16 16Stabilized operating data center NRSF 1,323,210 1,334,914 1,326,332 1,326,332 1,327,205Stabilized data center NRSF occupied 1,156,486 1,153,345 1,132,894 1,101,305 1,084,444Stabilized data center % occupied 87.4% 86.4% 85.4% 83.0% 81.7%Turn-Key Data Center Same Store Statistics MRR per Cabinet Equivalent $1,478 $1,447 $1,405 $1,399 $1,379Data center NRSF % occupied 81.7% 80.1% 79.8% 76.2% 74.6%Market Capitalization, Debt & Preferred Stock Total enterprise value $2,273,458 $1,967,868 $1,945,279 $1,831,690 $1,852,319Total debt outstanding 318,500 305,250 276,750 260,000 232,500Total debt and preferred stock outstanding 433,500 420,250 391,750 375,000 347,500Debt to: Annualized Adjusted EBITDA 2.2x 2.3x 2.0x 2.2x 2.1xUndepreciated book value of total assets 24.7% 24.2% 22.3% 21.6% 19.8%Debt & Preferred Stock to: Annualized Adjusted EBITDA 3.0x 3.2x 2.9x 3.1x 3.1xUndepreciated book value of total assets 33.6% 33.3% 31.5% 31.1% 29.6% 2014 Quarter Ended December 31, 2014

Consolidated Balance Sheets (in thousands) 11 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Consolidated Balance Sheets (in thousands)  December 31, 2014 December 31, 2013 Assets: Investments in real estate: Land $ 78,983 $ 78,983 Building and improvements 888,966 812,225 968,324 891,208 Less: Accumulated depreciation and amortization (215,978) (155,704) Net investment in operating properties 751,971 735,504 Construction in progress 178,599 157,317 Net investments in real estate 930,570 892,821 Cash and cash equivalents 10,662 5,313 Accounts and other receivables, net 10,290 10,339 Lease intangibles, net 7,112 11,028 Goodwill 41,191 41,191 Other assets 75,600 55,802  Total assets $ 1,075,425 $ 1,016,494  Liabilities and equity: Liabilities Revolving credit facility $ 218,500 $ 174,250 Senior unsecured term loan 100,000 - Mortgage loan payable - 58,250 Accounts payable and accrued expenses 42,463 48,978 Accrued dividends and distributions 22,355 18,804 Deferred rent payable 8,985 9,646 Acquired below-market lease contracts, net 5,576 6,681 Unearned revenue, prepaid rent and other liabilities 19,205 11,578 Total liabilities 417,084 328,187  Stockholders' equity Series A cumulative preferred stock 115,000 115,000 Common stock, par value $0.01 212 209 Additional paid-in capital 275,038 267,465 Accumulated other comprehensive loss (125) - Distributions in excess of net income (67,538) (50,264) Total stockholders' equity 322,587 332,410 Noncontrolling interests 335,754 355,897 Total equity 658,341 688,307  Total liabilities and equity $ 1,075,425 $ 1,016,494 2014 Quarter Ended December 31, 2014

Consolidated Statements of Operations (in thousands, except share and per share data) 12 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Three Months Ended Year Ended December 31, 2014 September 30, 2014 December 31, 2013 December 31, 2014 December 31, 2013 Data center revenue: Rental revenue $ 39,142 $ 38,315 $ 33,988 $ 149,294 $ 131,080 Power revenue 19,963 18,687 15,669 71,227 59,663 Interconnection revenue 9,536 9,169 7,866 35,355 28,932 Tenant reimbursement and other 1,991 2,328 1,885 8,702 7,317 Total data center revenue 70,632 68,499 59,408 264,578 226,992 Office, light-industrial and other revenue 1,860 2,016 2,032 7,842 7,841 Total operating revenues 72,492 70,515 61,440 272,420 234,833 Property operating and maintenance 20,253 20,043 17,247 75,119 64,260 Real estate taxes and insurance 2,519 3,073 1,708 7,578 8,458 Depreciation and amortization 22,422 20,914 17,151 80,722 65,785 Sales and marketing 3,413 3,806 3,474 14,554 14,405 General and administrative 6,260 7,145 7,092 27,842 27,317 Rent 5,148 5,113 5,028 20,397 19,659 Impairment of internal-use software - - - 1,959 - Transaction costs - 49 - 62 279 Total operating expenses 60,015 60,143 51,700 228,233 200,163 Operating income 12,477 10,372 9,740 44,187 34,670 Gain on land disposal 1,208 - - 1,208 - Interest income 1 1 14 6 32 Interest expense (1,362) (1,361) (759) (5,311) (2,689) Income before income taxes 12,324 9,012 8,995 40,090 32,013 Income tax (expense) benefit (18) (22) 34 (38) (401) Net income 12,306 8,990 9,029 40,052 31,612 Net income attributable to noncontrolling interests 5,557 3,759 3,809 17,287 12,771 Net income attributable to Core Site Realty Corporation 6,749 5,231 5,220 22,765 18,841 Preferred stock dividends (2,085) (2,084) (2,085) (8,338) (8,338) Net income attributable to common shares $ 4,664 $ 3,147 $ 3,135 $ 14,427 $ 10,503 Net income per share attributable to common shares: Basic $ 0.22 $ 0.15 $ 0.15 $ 0.68 $ 0.50 Diluted $ 0.21 $ 0.14 $ 0.15 $ 0.66 $ 0.49 Weighted average common shares outstanding: Basic 21,303,795 21,214,825 20,924,624 21,161,614 20,826,622 Diluted 21,794,138 21,708,759 21,492,301 21,740,707 21,503,212 2014 Quarter Ended December 31, 2014

Reconciliations of Net Income to FFO, AFFO, EBITDA and Adjusted EBITDA (in thousands, except per share data) Reconciliation of Net Income to FFO Reconciliation of FFO to AFFO Reconciliation of Net Income to EBITDA and Adjusted EBITDA 13 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Three Months Ended Year Ended  December 31, 2014 September 30, 2014 December 31, 2013 December 31, 2014 December 31, 2013 Net income $ 12,306 $ 8,990 $ 9,029 $ 40,052 $ 31,612  Real estate depreciation and amortization 19,968 18,988 16,146 73,955 62,040  Gain on land disposal (1,208) - - (1,208) -  FFO $ 31,066 $ 27,978 $ 25,175 $ 112,799 $ 93,652  Preferred stock dividends (2,085) (2,084) (2,085) (8,338) (8,338) FFO available to common shareholders and OP unit holders $ 28,981 $ 25,894 $ 23,090 $ 104,461 $ 85,314    Weighted average common shares outstanding - diluted 21,794 21,709 21,492 21,741 21,503  Weighted average OP units outstanding - diluted 25,361 25,361 25,361 25,361 25,356  Total weighted average shares and units outstanding - diluted 47,155 47,070 46,853 47,102 46,859    FFO per common share and OP unit - diluted $ 0.61 $ 0.55 $ 0.49 $ 2.22 $ 1.82       Three Months Ended Year Ended December 31, 2014 September 30, 2014 December 31, 2013 December 31, 2014 December 31, 2013 FFO available to common shareholders and OP unit holders $ 28,981 $ 25,894 $ 23,090 $ 104,461 $ 85,314 Adjustments: Amortization of deferred financing costs 420 448 446 1,897 1,739 Non-cash compensation 1,359 1,518 1,433 6,125 6,770 Non-real estate depreciation and amortization 2,454 1,926 1,005 6,767 3,745 Straight-line rent adjustment (1,390) (1,709) (304) (4,913) (1,274) Amortization of above and below-market leases (118) (256) (152) (556) (823) Impairment of internal-use software - - - 1,959 - Recurring capital expenditures (254) (1,125) (1,612) (4,429) (5,420) Tenant improvements (1,059) (666) (2,074) (4,512) (6,292) Capitalized leasing costs (7,250) (6,919) (2,447) (23,610) (5,698) AFFO available to common shareholders and OP unit holders $ 23,143 $ 19,111 $ 19,385 $ 83,189 $ 78,061 Three Months Ended Year Ended December 31, 2014 September 30, 2014 December 31, 2013 December 31, 2014 December 31, 2013 Net income $ 12,306 $ 8,990 $ 9,029 $ 40,052 $ 31,612 Adjustments: Interest expense, net of interest income 1,361 1,360 745 5,305 2,657 Income tax (benefit) expense 18 22 (34) 38 401 Depreciation and amortization 22,422 20,914 17,151 80,722 65,785 EBITDA $ 36,107 $ 31,286 $ 26,891 $ 126,117 $ 100,455 Non-cash compensation 1,359 1,518 1,433 6,125 6,770 Gain on land disposal (1,208) - - (1,208) - Transaction costs / litigation - 49 - 288 529 Impairment of internal-use software - - - 1,959 - Adjusted EBITDA $ 36,258 $ 32,853 $ 28,324 $ 133,281 $ 107,754 2014 Quarter Ended December 31, 2014

Operating Properties 14 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX See Appendix for definitions. Data Center Operating NRSF Stabilized Pre-Stabilized Total NRSF Under Construction(3) Held for Development NRSF Market/Facilities Annualized Rent ($000)(1) Total Percent Occupied(2) Total Percent Occupied Total Percent Occupied(2) Total NRSF  Los Angeles One Wilshire Campus LA1* $ 25,007 139,053 82.2 % - - % 139,053 82.2 % - - 139,053 LA2 18,296 161,911 84.0 63,002 34.9 224,913 70.2 - 199,978 424,891 Los Angeles Total 43,303 300,964 83.1 63,002 34.9 363,966 74.8 - 199,978 563,944  San Francisco Bay SV1 6,731 84,045 83.5 - - 84,045 83.5 - - 84,045 SV2 8,142 76,676 88.2 - - 76,676 88.2 - - 76,676 Santa Clara Campus 27,128 237,316 96.3 14,857 37.1 252,173 92.8 - 210,000 462,173 San Francisco Bay Total 42,001 398,037 92.1 14,857 37.1 412,894 90.1 - 210,000 622,894  Northern Virginia VA1 23,589 201,719 81.4 - - 201,719 81.4 - - 201,719 VA2 - - - - - - - 92,173 96,274 188,447 DC1* 3,023 22,137 88.8 - - 22,137 88.8 - - 22,137 Northern Virginia Total 26,612 223,856 82.1 - - 223,856 82.1 92,173 96,274 412,303  Boston BO1 13,791 166,026 98.2 - - 166,026 98.2 15,149 72,501 253,676  Chicago CH1 12,857 146,463 87.3 20,240 28.1 166,703 80.1 11,704 - 178,407  New York NY1* 5,475 48,404 68.7 - - 48,404 68.7 - - 48,404 NY2 2,561 - - 52,692 51.9 52,692 51.9 49,050 146,036 247,778 New York Total 8,036 48,404 68.7 52,692 51.9 101,096 59.9 49,050 146,036 296,182  Miami MI1 1,807 30,176 81.2 - - 30,176 81.2 - 13,154 43,330  Denver DE1* 994 4,144 100.0 - - 4,144 100.0 1,734 - 5,878 DE2* 306 5,140 65.3 - - 5,140 65.3 - - 5,140 Denver Total 1,300 9,284 80.8 - - 9,284 80.8 1,734 - 11,018 Total Data Center Facilities $ 149,707 1,323,210 87.4 % 150,791 40.1 % 1,474,001 82.6 % 169,810 737,943 2,381,754  Office & Light-Industrial 6,939 347,120 77.5 - - 347,120 77.5 - - 347,120  Total Portfolio $ 156,646 1,670,330 85.3 % 150,791 40.1 % 1,821,121 81.6 % 169,810 737,943 2,728,874  * Indicates properties in which we hold a leasehold interest. (1) On a gross basis, our total portfolio annualized rent was approximately $161.8 million as of December 31, 2014, which reflects the addition of $5.2 million in operating expense reimbursements to contractual net rent under modified gross and triple-net leases. (2) Includes customer leases that have commenced and are occupied as of December 31, 2014. If all leases signed during the current and prior periods had commenced, the percent occupied would have been as follows:  Percent Leased Stabilized Pre-Stabilized Total Total Data Center Facilities 89.7% 52.2% 85.9% Total Portfolio 87.3% 52.2% 84.4% (3) VA2 Phase 1, which is 44,036 NRSF under development, is 100% leased to a single customer as of December 31, 2014. The customer lease is anticipated to commence on April 1, 2015. 2014 Quarter Ended December 31, 2014

Leasing Statistics Data Center Leasing Activity MRR per Cabinet Equivalent (Turn-key Data Center Same Store) 15 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 6.8% y-o-y 7.2% y-o-y 7.7% y-o-y 7.0% y-o-y 7.1% y-o-y  GAAP GAAP Leasing Number Annualized Total Annualized Rental Cash GAAP Activity of Rent Leased Rent per Churn Rent Rent Period Leases(1) (000's) NRSF Leased NRSF Rate Growth Growth New/expansion leases commenced FY 2014 466 $ 22,924 167,735 $ 137 Q4 2014 106 4,943 34,009 145 Q3 2014 115 6,066 45,014 135 Q2 2014 126 8,152 60,587 135 Q1 2014 119 3,763 28,125 134 Q4 2013 109 4,808 116,052 41 (2) New/expansion leases signed FY 2014 466 $ 33,189 244,477 $ 136 (3) Q4 2014 96 11,075 91,662 121 (3) Q3 2014 118 7,607 54,123 141 Q2 2014 121 9,368 58,909 159 Q1 2014 131 5,139 39,783 129 Q4 2013 122 3,472 26,276 132 Renewal leases signed FY 2014 352 $ 29,327 163,306 $ 180 5.6% 2.9% 8.6% Q4 2014 78 6,705 43,863 153 1.4% 2.6% 5.2% Q3 2014 123 12,078 55,262 219 1.2% 3.0% 10.6% Q2 2014 77 7,009 41,890 167 1.8% 2.1% 8.1% Q1 2014 74 3,535 22,291 159 1.2% 4.7% 9.4% Q4 2013 59 6,816 50,513 135 1.9% 3.5% 14.3% (1) Number of leases represents each agreement with a customer; a lease agreement could include multiple spaces and a customer could have multiple leases. (2) The GAAP annualized rent per leased NRSF for new/expansion leases commenced in Q4 2013 includes a 101,721 NRSF built-to-suit lease. Excluding this lease, the GAAP annualized rent per leased NRSF for new/expansion leases commenced in Q4 2013 would have been $116. (3) During Q4 2014, we signed a 44,036 NRSF lease with a single customer for the entire VA2 Phase 1 facility under construction as of December 31, 2014. 2014 Quarter Ended December 31, 2014

Leasing Statistics Lease Expirations (total portfolio, including total data center and office and light-industrial “OLI”) Lease Distribution (total portfolio, including total data center and office and light-industrial “OLI”) 16 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Total Percentage Percentage Number Percentage Operating of Total Annualized of Total of of All NRSF of Operating Rent Annualized Square Feet Under Lease Leases Leases Leases NRSF ($000) Rent Unoccupied colocation - - % 256,753 14.1 % $ - - % Unoccupied OLI - - 78,226 4.3 - - Colocation NRSF: 5,000 or less 1,449 90.8 489,774 26.8 79,557 50.8 5,001 - 10,000 24 1.5 163,274 9.0 22,429 14.3 10,001 - 25,000 15 0.9 204,975 11.3 29,872 19.1 Greater than 25,000 2 0.1 63,545 3.5 7,600 4.9 Powered shell 13 0.8 295,680 16.3 10,249 6.5 OLI 94 5.9 268,894 14.7 6,939 4.4 Portfolio Total 1,597 100.0 % 1,821,121 100.0 % $ 156,646 100.0 % Total Annualized Number Operating Percentage Percentage Annualized Annualized Rent Per of NRSF of of Total Annualized of Total Rent Per Rent at Leased Leases Expiring Operating Rent Annualized Leased Expiration NRSF at Year of Lease Expiration Expiring(1) Leases NRSF ($000) Rent NRSF ($000)(2) Expiration Unoccupied colocation - 256,753 14.1 % $ - - % $ - $ - $ - Unoccupied OLI - 78,226 4.3 - - - - - 2015 599 231,820 12.7 35,858 22.9 155 37,042 160 2016 382 223,197 12.3 32,537 20.8 146 35,253 158 2017 334 219,839 12.1 37,466 23.9 170 41,159 187 2018 82 172,418 9.5 18,405 11.7 107 21,511 125 2019 70 142,020 7.8 9,982 6.4 70 16,132 114 2020-Thereafter 36 227,954 12.5 15,459 9.9 68 22,846 100 OLI (3) 94 268,894 14.7 6,939 4.4 26 6,945 26 Portfolio Total / Weighted Average 1,597 1,821,121 100.0 % $ 156,646 100.0 % $ 105 $ 180,888 $ 122  2014 Quarter Ended December 31, 2014

Geographic and Vertical Diversification Geographic Diversification Vertical Diversification 17 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Percentage of Total Data Metropolitan Market Center Annualized Rent Los Angeles 28.9 % San Francisco Bay 28.0 Northern Virginia 17.8 Boston 9.2 Chicago 8.6 New York 5.4 Miami 1.2 Denver 0.9 Total 100.0 % Percentage of Total Data  Vertical Center Annualized Rent  Enterprise:   Digital Content & Multimedia 27.4 %  SI & MSP 12.3   Other Enterprise 12.0  Total Enterprise 51.7  Networks & Mobility 24.4  Cloud 23.9  Total 100.0 % 2014 Quarter Ended December 31, 2014

10 Largest Customers 10 Largest Customers (total portfolio, including data center and office and light-industrial) 18 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX  Weighted Percentage Percentage Average Number Total of Total Annualized of Total Remaining of Occupied Operating Rent Annualized Lease Term in Customer Industry CoreSite Vertical Locations NRSF NRSF(1) ($000) Rent(2) Months(3) 1 Technology Enterprise - Digital Content 4 41,811 2.3 % $ 10,692 6.8 % 22 2 Technology Cloud 8 142,687 7.8 10,089 6.4 55 3 Technology Enterprise - SI & MSP 3 53,014 2.9 6,758 4.3 32 4 Technology Enterprise - Digital Content 10 65,687 3.6 5,932 3.8 10 5 Government* Enterprise - Other 1 130,960 7.2 3,906 2.5 84 6 Technology Cloud 1 28,923 1.6 3,884 2.5 46 7 Financial(4) Enterprise - Other 2 12,188 0.7 3,130 2.0 116 8 Technology Enterprise - SI & MSP 1 6,417 0.4 2,646 1.7 25 9 Managed Services Enterprise - SI & MSP 1 23,663 1.3 2,381 1.5 99 10 Government Enterprise - Other 2 16,769 0.9 2,373 1.6 54 Total/Weighted Average 522,119 28.7 % $ 51,791 33.1 % 46 * 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 which, as of December 31, 2014, consisted of 1,821,121 NRSF. (2) Represents the customer’s total annualized rent divided by the total annualized rent in the portfolio as of December 31, 2014, which was approximately $156.6 million. (3) Weighted average based on percentage of total annualized rent expiring calculated as of quarter-end. (4) Customer's lease term includes auto renewal provisions at the end of years four and six, which the customer may opt out of by paying termination fees of $0.4 million and $0.3 million, respectively. 2014 Quarter Ended December 31, 2014

Capital Expenditures & Completed Pre-Stabilized Projects (in thousands, except NRSF data) Completed Pre-Stabilized Projects Capital Expenditures and Repairs and Maintenance 19 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX  Three Months Ended December 31, 2014 September 30, 2014 June 30, 2014 March 31, 2014 December 31, 2013 Data center expansion(1) $ 19,147 $ 14,166 $ 32,082 $ 18,917 $ 46,574 Non-recurring investments(2) 1,838 2,304 2,671 5,714 9,330 Tenant improvements 1,059 666 1,579 1,208 2,074 Recurring capital expenditures(3) 254 1,125 1,377 1,673 1,612 Total capital expenditures $ 22,298 $ 18,261 $ 37,709 $ 27,512 $ 59,590 Repairs and maintenance expense(4) $ 2,485 $ 2,186 $ 2,600 $ 2,284 $ 2,665 (1) Data center expansion capital expenditures include new data center construction, development projects adding capacity to existing data centers and other revenue generating investments. (2) Non-recurring investments include upgrades to existing data center or office space and company-wide improvements that are ancillary to revenue generation such as internal system development and system-wide security upgrades, which have a future economic benefit. (3) Recurring capital expenditures include required equipment upgrades within our operating portfolio, which have a future economic benefit. (4) Repairs and maintenance expense is classified within 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. Projects/Facilities Metropolitan Area Completion NRSF Cost Percent Leased(1) Percent Occupied LA2 Los Angeles Mar 2013 8,122 $ 871 43.6 % 43.6 % LA2 Los Angeles Mar 2013 21,169 8,866 83.8 83.8 SV4 San Francisco Bay Apr 2013 14,857 12,911 74.4 37.1 CH1 Chicago Apr 2013 20,240 5,200 28.1 28.1 NY2 New York Dec 2013 18,103 14,417 85.0 69.5 LA2 Los Angeles Feb 2014 33,711 9,800 4.0 2.1 NY2 New York Mar 2014 16,484 14,540 73.4 73.4 NY2 New York Mar 2014 18,105 14,540 65.4 14.6 Total completed pre-stabilized 150,791 $ 81,145 52.2 % 40.1 % (1) Includes customer leases that have been signed as of December 31, 2014, but have not commenced. The percent leased is determined based on leased square feet as a proportion of total pre-stabilized NRSF. 2014 Quarter Ended December 31, 2014

Development Summary (in thousands, except NRSF data) Data Center Projects Under Construction 20 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Held for Development(1) Costs Projects/Facilities Metropolitan Area Estimated Completion NRSF Incurred to-date Estimated Total VA2 Phase 1 (1) Northern Virginia Q1 2015 44,036 $ 76,014 $ 76,100 VA2 Phase 2 Northern Virginia Q2 2015 48,137 1,496 13,300 NY2 Phase 2 New York Q2 2015 49,050 2,266 21,330 DE1 Denver Q2 2015 1,734 711  1,500 CH1 Chicago Q3 2015 11,704 505  7,000 BO1 Boston Q4 2015 15,149 203  9,500 Total under construction  169,810 $ 81,195 $ 128,730 (1) VA2 Phase 1 is 100% leased to a single customer as of December 31, 2014. The customer lease is anticipated to commence April 1, 2015. Projects/Facilities Metropolitan Area Estimated NRSF Estimated Sellable Power (Megawatts) Estimated Incremental Costs Estimated Incremental Cost per MW Incremental Cost per NRSF New construction  Santa Clara Campus San Fransisco Bay 210,000 - 348,000 20.0 - 35.0  Secaucus, NJ New York 58,739 - 158,739 3.0 - 9.0    Incremental capacity in existing facilities  VA2 (Phases 3-4) Northern Virginia 96,274 6.0 $ 35,000 $ 5,833 $ 0.36  NY2 (Phases 3-4) New York 87,297 8.5 57,000 6,706 $ 0.65  BO1 Boston 72,501 6.0 50,000 8,333 $ 0.69  LA2 Los Angeles 199,978 14.0 75,000 5,357 $ 0.38  MI1 Miami 13,154 1.0 7,500 7,500 $ 0.57  Total incremental capacity 469,204 35.5 $ 224,500 $ 6,324 $ -    Total new construction & incremental capacity 737,943 - 975,943 58.5 - 79.5    (1) Represents data center space that may be constructed on entitled and unentitled land and incremental data center capacity that may be constructed in existing facilities. The data presented represents management's best estimate of incremental costs that may vary based on estimated NRSF and power and are subject to market conditions and build-out specifications.  2014 Quarter Ended December 31, 2014

Market Capitalization and Debt Summary (in thousands, except per share data) Market Capitalization Debt Maturities Debt Summary (1) 21 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX  Shares or Equivalents Outstanding Market Price / Liquidation Value as of December 31, 2014 Market Value Equivalents Common shares 21,757 $39.05 $ 849,611 Operating partnership units 25,361 $39.05  990,347 Liquidation value of preferred stock 4,600 $25.00  115,000 Total equity  1,954,958 Total debt  318,500 Total enterprise value $ 2,273,458 Total debt to annualized adjusted EBITDA 2.2x Total debt and preferred stock to annualized adjusted EBITDA 3.0x  Maturity Outstanding as of: Maturity Date with December 31, December 31, Instrument Rate Date Extension 2014 2013 Revolving credit facility (2) 2.17% 1/3/2017 1/3/2018 $ 218,500 $ 174,250 Senior unsecured term loan (3) 3.23% 1/31/2019 1/31/2019 100,000  - SV1 - mortgage loan N/A N/A  - 58,250 Total Debt $ 318,500 $ 232,500 Weighted average debt rate 2.50% Preferred Stock 7.25% N/A N/A 115,000 115,000 Total Debt and Preferred Stock $ 433,500 $ 347,500 Floating rate vs. fixed rate debt 67% / 33% 100% / 0% Floating rate vs. fixed rate debt and preferred stock 50% / 50% 67% / 33% (1) See the most recently filed Form 10-K and 10-Q for information on specific debt instruments. (2) The revolving credit facility interest rate is based on LIBOR at December 31, 2014, plus applicable spread. (3) Represents the effective interest rate as a result of the interest rate swap agreement associated with $100 million in 1-month LIBOR variable rate debt. 2014 Quarter Ended December 31, 2014

Interest Summary and Debt Covenants (in thousands) Interest Expense Components Debt Covenants 22 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX  Three Months Ended Year Ended  December 31, 2014 September 30, 2014 December 31, 2013 December 31, 2014 December 31, 2013  Interest expense and fees $ 2,183 $ 2,105 $ 1,652 $ 8,047 $ 5,312   Amortization of deferred financing costs 420 448  446 1,897 1,739   Capitalized interest (1,241) (1,192) (1,339) (4,633) (4,362) Total interest expense $ 1,362 $ 1,361 $ 759 $ 5,311 $ 2,689    Percent capitalized 47.7% 46.7% 63.8% 46.6% 61.9%    Revolving Credit Facility & Senior Unsecured Term Loan Required Compliance December 31, 2014 September 30, 2014 June 30, 2014 March 31, 2014 December 31, 2013  Fixed charge coverage ratio Greater than 1.75x 8.4x 7.7x 7.5x 7.8x 7.2x Total indebtedness to gross asset value Less than 60% 17.2% 17.5% 16.4% 15.6% 15.5% Secured debt to gross asset value Less than 40% 0.0% 0.0% 0.0% 0.0% 3.7% Unhedged variable rate debt to gross asset value Less than 30% 11.6% 11.5% 10.2% 9.3% 14.9%   Facility availability $405,000 $405,000 $405,000 $405,000 $405,000 Borrowings outstanding (218,500) (205,250) (176,750) (160,000) (174,250) Outstanding letters of credit (7,330) (7,330) (7,330) (8,390) (8,390) Current availability $179,170 $192,420 $220,920 $236,610 $222,360  2014 Quarter Ended December 31, 2014 

Components of Net Asset Value (NAV) (in thousands) 23 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX Cash Net Operating Income Development Projects Other Assets and Liabilities Reconciliation of Net Operating Income (NOI) Q4 2014 Annualized  Operating Income $ 12,477 $ 49,908  Adjustments:   Depreciation and amortization 22,422 89,688   General and administrative 6,260 25,040   Transaction costs - -  Net Operating Income $ 41,159 $ 164,636    Cash Net Operating Income (Cash NOI)  Net Operating Income $ 41,159 $ 164,636  Adjustments:   Straight-line rent (1,390) (5,560)   Amortization of above and below-market leases (118) (472)  Cash NOI $ 39,651 $ 158,604    Cash NOI with backlog (84.4% leased)(1) $ 42,173 $ 168,692  Cash stabilized NOI (93% leased) $ 46,470 $ 185,881    Data Center Projects Under Construction  Construction in progress(2) $ 81,195  Remaining spend(2) 47,535  Total $ 128,730    Targeted annual yields 12% - 16%  Annualized pro forma NOI range $15,450 - $20,600    Other Assets  Remaining construction in progress(3) $ 97,404  Cash and cash equivalents 10,662  Accounts and other receivables 10,290  Other tangible assets 24,069  Total other assets $ 142,425    Liabilities  Debt $ 318,500  Accounts payable, accrued and other liabilities 84,023  Preferred equity 115,000  Total liabilities $ 517,523      Weighted average common shares and units - diluted 47,155      (1) Cash NOI with backlog is adjusted to include one quarter of the cash backlog as of December 31, 2014, less any leasing of currently occupied NRSF and data center projects under development. (2) Does not include spend associated with leasing commissions. See page 20 for further breakdown of data center projects under construction. (3) Represents the book value of in progress capital projects, including land and shell building, of future NY2 and VA2 phases and other data center expansion, non-recurring investments, tenant improvements and recurring capital expenditures.  2014 Quarter Ended December 31, 2014  

2015 Guidance (in thousands, except per share amounts) 24 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX The annual guidance provided below represents forward-looking projections, which are based on current economic conditions, internal assumptions about our existing customer base and the supply and demand dynamics of the markets in which we operate. Further, the guidance does not include the impact of any future financing, investment or disposition activities. Please refer to the press release for additional information on forward-looking statements. Projected per share and OP unit information: 2015 Implied Low High Mid 2014 Growth(1) Net income attributable to common shares $ 0.75 $ 0.85 $ 0.80 $ 0.66 21% Real estate depreciation and amortization 1.80 1.80 1.58 Gain on land disposal - - (0.02) FFO $ 2.55 $ 2.65 $ 2.60 $ 2.22 Non-recurring items: Q2 benefit from real estate tax accrual true-up - - - (0.08) Q1 and Q2 charges for software impairment - - - 0.04 FFO - excluding non-recurring items(2) $ 2.55 $ 2.65 $ 2.60 $ 2.18 19% Projected operating results: Total operating revenues $ 313,000 $ 323,000 $ 318,000 $ 272,420 17% Data center revenue 305,000 315,000 310,000 264,578 17% General and administrative expenses 30,000 32,000 31,000 27,842 11% Adjusted EBITDA(3) 153,000 158,000 155,500 129,634 20% Guidance drivers: Annual rental churn rate 6.0% 8.0% 7.0% 5.6% Cash rent growth on data center renewals 2.0% 5.0% 3.5% 2.9% Capital expenditures: Data center expansion $ 65,000 $ 80,000 $ 72,500 $ 84,312 Non-recurring investments 10,000 15,000 12,500 12,527 Tenant improvements 5,000 10,000 7,500 4,512 Recurring capital expenditures 5,000 10,000 7,500 4,429 Total capital expenditures $ 85,000 $ 115,000 $ 100,000 $ 105,780 (1) Implied growth is based on the midpoint of 2015 guidance. (2) 2014 FFO was adjusted to exclude non-recurring items, including a benefit from real estate tax accrual true-up and charges for software impairment. (3) 2014 Adjusted EBITDA was reported as $133,281 and was also adjusted to exclude a $3,647 benefit from real estate tax accrual true-up. 2014 Quarter Ended December 31, 2014

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. 25 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

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: Plus: Amortization of deferred financing costs Plus: Non-cash compensation Plus: Non-real estate depreciation Plus: Impairment charges Plus: Below market debt amortization Less: Straight line rents adjustment Less: Amortization of above and below market leases Less: Recurring capital expenditures Less: Tenant improvements Less: Capitalized leasing costs 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. 26 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

Appendix Data Center Net Rentable Square Feet (“NRSF”) Both occupied and available data center NRSF includes a factor 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. 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. NRSF Held for Development Represents incremental data center capacity that may be constructed in existing facilities and entitled land in our portfolio that requires significant capital investment in order to develop new data center facilities. In addition to entitled land, we may develop an additional 138,000 NRSF at the Santa Clara Campus and 100,000 NRSF at NY2 upon our receipt of the necessary entitlements. 27 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014

Appendix 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 948,427 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 GAAP annualized rent of data center expired leases terminated in the period, compared with total GAAP 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. 28 OVERVIEW FINANCIAL STATEMENTS OPERATING PORTFOLIO DEVELOPMENT CAPITAL STRUCTURE COMPONENTS OF NAV 2015 GUIDANCE APPENDIX 2014 Quarter Ended December 31, 2014