Earnings Release and Supplemental Information Quarter Ended March 31, 2014

Table of Contents 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 and EBITDA 13 Operating Portfolio Operating Properties 14 Leasing Statistics 15 Geographic Diversification and 10 Largest Customers 17 Development Summary and Capital Expenditures 18 Capital Structure Market Capitalization and Debt Summary 19 Interest Summary and Debt Covenants 20 2014 Guidance 21 Appendix 22

CORESITE REPORTS FIRST-QUARTER FUNDS FROM OPERATIONS INCREASED 19% YEAR OVER YEAR Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix DENVER, CO – April 24, 2014 CoreSite Realty Corporation (NYSE:COR), a provider of secure, reliable, high-performance data center solutions, today announced financial results for the first quarter ended March 31, 2014. Quarterly and Subsequent Highlights • Reported first-quarter funds from operations (“FFO”) of $0.49 per diluted share and unit, representing a 19.5% increase year-over-year • Reported first-quarter total operating revenues of $63.7 million, representing a 15.7% increase year-over-year • Executed new and expansion data center leases representing $5.1 million of GAAP annualized rent at a rate of $129 per square foot • Realized rent growth on signed renewals of 4.7% on a cash basis and 9.4% on a GAAP basis and rental churn of 1.2% • Commenced 28,125 net rentable square feet of new and expansion leases with GAAP annualized rent of $134 per square foot, increasing stabilized data center occupancy to 83.0% Tom Ray, CoreSite’s Chief Executive Officer, commented, “We are pleased that our first-quarter results reflect continued execution of our business plan, with total operating revenues and adjusted EBITDA increasing 16% and 21% year over year, respectively.” Mr. Ray continued, “Importantly, we recorded an increase in new and expansion sales, with 131 new and expansion leases executed representing $5.1 million in annualized GAAP rent. This represents a 48% increase over the prior quarter and a 12% increase over the trailing-year quarterly average. In addition, we increased the number of quota-bearing sales reps across our platform by 21%, reflecting progress against our goal to increase in-place quota coverage by approximately 35% over the course of 2014.”

Quarter Ended March 31, 2014 Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix Financial Results CoreSite reported FFO attributable to shares and units of $22.9 million for the three months ended March 31, 2014, an 18.8% increase year-over-year and a decrease of 1.0% compared to prior quarter. On a per diluted share and unit basis, FFO increased 19.5% to $0.49 for the three months ended March 31, 2014, as compared to $0.41 per diluted share and unit for the three months ended March 31, 2013. Total operating revenues for the three months ended March 31, 2014, were $63.7 million, a 15.7% increase year over year. CoreSite reported net income attributable to common shares of $2.7 million, or $0.13 per diluted share. Sales Activity CoreSite executed 131 new and expansion data center leases representing $5.1 million of GAAP annualized rent during the first quarter, comprised of 39,783 NRSF at a weighted average GAAP rate of $129 per NRSF. CoreSite’s renewal leases signed in the first quarter totaled $3.5 million in GAAP annualized rent, comprised of 22,291 NRSF at a weighted average GAAP rate of $159 per NRSF, reflecting a 4.7% increase in rent on a cash basis and a 9.4% increase on a GAAP basis. The first-quarter rental churn rate was 1.2%. CoreSite’s first-quarter data center lease commencements totaled 28,125 NRSF at a weighted average GAAP rental rate of $134 per NRSF, which represents $3.8 million of GAAP annualized rent. Development Activity In the first quarter, CoreSite delivered two additional computer rooms totaling 34,589 NRSF of turn-key data center (TKD) capacity in the New York market at our NY2 facility and placed into service 33,711 NRSF of TKD capacity in Los Angeles at our LA2 facility. CoreSite had 50,000 NRSF of data center space under construction at VA2 in Northern Virginia at the end of the first quarter. As of March 31, 2014, CoreSite had incurred $38.7 million of the estimated $73.5 million required to complete this project.

Quarter Ended March 31, 2014 Balance Sheet and Liquidity As of March 31, 2014, CoreSite had $260.0 million of total long-term debt equal to 2.2x annualized adjusted EBITDA and $375.0 million of long-term debt and preferred stock equal to 3.1x annualized adjusted EBITDA. At quarter end, CoreSite had $10.2 million of cash available on its balance sheet and $236.6 million of available capacity under its credit facility. Dividend On March 6, 2014, CoreSite announced a dividend of $0.35 per share of common stock and common stock equivalents for the first quarter of 2014. The dividend was paid on April 15, 2014, to shareholders of record on March 31, 2014. CoreSite also announced on March 6, 2014, a dividend of $0.4531 per share of Series A preferred stock for the period January 15, 2014, to April 14, 2014. The preferred dividend was paid on April 15, 2014, to shareholders of record on March 31, 2014. 2014 Guidance CoreSite is maintaining its 2014 guidance of FFO per diluted share and unit in the range of $2.00 to $2.10. In addition, CoreSite is maintaining its 2014 guidance for net income attributable to common shares in the range of $0.50 to $0.60 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 the Stephens Spring Investment Conference on June 3, 2014, at the New York Palace Hotel in New York, NY and NAREIT’s REITWeek conference from June 4, 2014, through June 5, 2014, at the Waldorf Astoria in New York, NY. Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix

Quarter Ended March 31, 2014 Conference Call Details CoreSite will host a conference call on April 24, 2014, 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 13578866. The replay will be available until May 1, 2014. 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” tab. 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 and reliable data center solutions across eight key North American markets. CoreSite connects, protects and delivers an optimal performance environment and continued operation of mission-critical data and IT infrastructure for enterprises and Internet, private networking, mobility, and cloud service providers. CoreSite's scalable platform of over two and a half million square feet of efficient, network-dense, cloud-enabled data center capacity enables customers to accelerate business performance, reduce operating costs and increase flexibility across their IT and communications systems. CoreSite's 350+ professionals deliver best-in-class service by placing customer needs first in supporting the planning, implementation and operating requirements foundational to delivering reliable, secure and efficient IT operating environments. More than 800 of the world's leading enterprises, carriers and mobile operators, content and cloud providers and media and entertainment companies choose CoreSite to connect, protect and optimize their performance-sensitive data, applications and computing workloads. CoreSite provides direct access to more than 275 carriers and ISPs, inter-site connectivity and CoreSite's Open Cloud Exchange, which supports rapid, efficient and scalable Ethernet access to multiple key public clouds, enabling simple, flexible, multi-cloud capabilities. 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 Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix

Quarter Ended March 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. Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix

Company Profile CoreSite delivers network-dense, cloud-enabled, enterprise-class data center products and services across eight key North American markets. Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix

Company Profile NYSE-traded with a strong balance sheet NYSE: COR (2010); REIT status Predecessor entities founded in 2000 Equity market cap: $1.5 billion at March 31, 2014 Growth capacity: 2.2x debt to annualized adjusted EBITDA and 3.1x debt and preferred stock to annualized adjusted EBITDA at March 31, 2014 Scalable and flexible, broad platform in Tier-1 markets Recent delivery of our newest data center, NY2, located in Secaucus, NJ 16 data centers in eight top North American markets located in network, financial, cloud and commerce hubs 2.5+ million gross square feet Ability to nearly double data center footprint on land and buildings currently owned Dense network connectivity and ecosystems Over 275 network service providers, 800 customers and 15,000 cross-connects Key ecosystems of customers and partners consisting of 35% networks and mobility, 24% cloud and IT service providers, 21% enterprise, 14% digital content and multimedia, and 6% systems integrators and managed services providers Partner-enabled value-added services supporting cloud computing Secure and reliable with best-in-class service Six 9s uptime for three consecutive years 350+ professionals with dedicated industry experts and 24x7 security guard monitoring Cabinet, standard or custom cage, computer rooms Cross-connects, Any2 Internet Exchange, Cloud Exchange – Ethernet Breakered and metered power Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix

Summary of Financial Data (in thousands, except share, per share and NRSF data) Three Months Ended March 31, December 31, March 31, Summary of Results 2014 2013 2013 Operating revenues $ 63,731 $ 61,440 $ 55,091 Data center revenues 61,716 59,408 53,199 Net income 8,118 9,029 6,195 Net income attributable to common shares 2,733 3,135 1,849 Funds from operations (FFO) to shares and units 22,870 23,090 19,253 Adjusted funds from operations (AFFO) 19,356 19,385 17,707 EBITDA 27,191 26,891 22,754 Adjusted EBITDA 30,059 28,324 24,754 Per share - diluted: Net income attributable to common shares $ 0.13 $ 0.15 $ 0.09 FFO per common share and OP unit $ 0.49 $ 0.49 $ 0.41 As of March 31, December 31, September June 30, March 31, 2014 2013 30, 2013 2013 2013 Dividend Activity Dividends declared per share and OP unit $ 0.35 $ 0.35 $ 0.27 $ 0.27 $ 0.27 AFFO payout ratio 84% 84% 61% 62% 71% Operating Portfolio Statistics Operating data center properties 16 16 14 14 14 Operating data center NRSF 1,326,332 1,327,205 1,225,596 1,225,596 1,208,365 Data center NRSF occupied 1,101,305 1,084,444 987,416 986,646 963,442 Data center % occupied 83.0% 81.7% 80.6% 80.5% 79.7% Turn-Key Data Center Same Store Statistics MRR per Cabinet Equivalent $ 1,399 $ 1,379 $ 1,352 $ 1,305 $ 1,305 Data center NRSF % occupied 76.2% 74.6% 75.0% 75.0% 74.3% Market Capitalization, Debt & Preferred Stock Total enterprise value $ 1,831,690 $ 1,852,319 $ 1,869,100 $ 1,734,594 $ 1,861,410 Total debt outstanding 260,000 232,500 166,625 132,000 111,375 Total debt and preferred stock outstanding 375,000 347,500 281,625 247,000 226,375 Debt to: Annualized Adjusted EBITDA 2.2x 2.1x 1.5x 1.2x 1.1x Undepreciated book value of total assets 21.6% 19.8% 15.0% 12.7% 11.1% Debt & Preferred Stock to: Annualized Adjusted EBITDA 3.1x 3.1x 2.6x 2.3x 2.3x Undepreciated book value of total assets 31.1% 29.6% 25.4% 23.8% 22.5% Development Financial Operating Capital 2014 10 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Consolidated Balance Sheets (in thousands) March 31, December 31, 2014 2013 Assets: Investments in real estate: Land $ 79,929 $ 78,983 Building and building improvements 760,624 717,007 Leasehold improvements 96,834 95,218 937,387 891,208 Less: Accumulated depreciation and amortization (170,132) (155,704) Net investment in operating properties 767,255 735,504 Construction in progress 134,725 157,317 Net investments in real estate 901,980 892,821 Cash and cash equivalents 10,153 5,313 Accounts and other receivables, net 10,454 10,339 Lease intangibles, net 9,933 11,028 Goodwill 41,191 41,191 Other assets 61,961 55,802 Total assets $ 1,035,672 $ 1,016,494 Liabilities and equity: Liabilities Revolving credit facility $ 160,000 $ 174,250 Senior unsecured term loan 100,000 - Mortgage loan payable - 58,250 Accounts payable and accrued expenses 63,469 67,782 Deferred rent payable 9,530 9,646 Acquired below-market lease contracts, net 6,426 6,681 Prepaid rent and other liabilities 15,561 11,578 Total liabilities 354,986 328,187 Stockholders’ equity Series A cumulative preferred stock 115,000 115,000 Common stock, par value $0.01 210 209 Additional paid-in capital 269,510 267,465 Accumulated other comprehensive income 288 - Distributions in excess of net income (54,992) (50,264) Total stockholders’ equity 330,016 332,410 Noncontrolling interests 350,670 355,897 Total equity 680,686 688,307 Total liabilities and equity $ 1,035,672 $ 1,016,494 Development Financial Operating Capital 2014 11 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Consolidated Statements of Operations (in thousands, except share and per share data) Three Months Ended March 31, December 31, March 31, 2014 2013 2013 Operating revenues: Data center revenue: Rental revenue $ 34,899 $ 33,988 $ 31,309 Power revenue 16,002 15,669 13,529 Interconnection revenue 8,059 7,866 6,572 Tenant reimbursement and other 2,756 1,885 1,789 Total data center revenue 61,716 59,408 53,199 Office, light industrial and other revenue 2,015 2,032 1,892 Total operating revenues 63,731 61,440 55,091 Operating expenses: Property operating and maintenance 16,289 17,247 14,527 Real estate taxes and insurance 2,966 1,708 2,220 Depreciation and amortization 17,882 17,151 15,949 Sales and marketing 3,588 3,474 3,789 General and administrative 8,627 7,092 7,003 Rent 5,066 5,028 4,793 Transaction costs 4 - 5 Total operating expenses 54,422 51,700 48,286 Operating income 9,309 9,740 6,805 Interest income 2 14 2 Interest expense (1,173) (759) (439) Income before income taxes 8,138 8,995 6,368 Income tax (expense) benefit (20) 34 (173) Net income 8,118 9,029 6,195 Net income attributable to noncontrolling interests 3,301 3,809 2,262 Net income attributable to CoreSite Realty Corporation 4,817 5,220 3,933 Preferred dividends (2,084) (2,085) (2,084) Net income attributable to common shares $ 2,733 $ 3,135 $ 1,849 Net income per share attributable to common shares: Basic $ 0.13 $ 0.15 $ 0.09 Diluted $ 0.13 $ 0.15 $ 0.09 Weighted average common shares outstanding: Basic 20,992,758 20,924,624 20,673,896 Diluted 21,521,838 21,492,301 21,314,779 Development Financial Operating Capital 2014 12 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Reconciliations of Net Income to FFO, AFFO and EBITDA (in thousands, except share and per share data) Reconciliation of Net Income to FFO Three Months Ended March 31, December 31, March 31, 2014 2013 2013 Net income $ 8,118 $ 9,029 $ 6,195 Real estate depreciation and amortization 16,836 16,146 15,142 FFO $ 24,954 $ 25,175 $ 21,337 Preferred stock dividends (2,084) (2,085) (2,084) FFO available to common shareholders and OP unit holders $ 22,870 $ 23,090 $ 19,253 Weighted average common shares outstanding - diluted 21,521,838 21,492,301 21,314,779 Weighted average OP units outstanding - diluted 25,360,847 25,360,847 25,353,709 Total weighted average shares and units outstanding - diluted 46,882,685 46,853,148 46,668,488 FFO per common share and OP unit - diluted $ 0.49 $ 0.49 $ 0.41 Reconciliation of FFO to AFFO Three Months Ended March 31, December 31, March 31, 2014 2013 2013 FFO available to common shareholders and unit holders $ 22,870 $ 23,090 $ 19,253 Adjustments: Amortization of deferred financing costs 580 446 420 Non-cash compensation 1,716 1,433 1,895 Non-real estate depreciation 1,046 1,005 807 Straight-line rent adjustment (436) (304) (92) Amortization of above and below market leases (70) (152) (232) Impairment of internal-use software 922 - - Recurring capital expenditures (1,673) (1,612) (1,699) Tenant improvements (1,208) (2,074) (1,613) Capitalized leasing commissions (4,391) (2,447) (1,032) AFFO available to common shareholders and OP unit holders $ 19,356 $ 19,385 $ 17,707 Reconciliation of Net Income to EBITDA and Adjusted EBITDA Three Months Ended March 31, December 31, March 31, 2014 2013 2013 Net income $ 8,118 $ 9,029 $ 6,195 Adjustments: Interest expense, net of interest income 1,171 745 437 Income taxes 20 (34) 173 Depreciation and amortization 17,882 17,151 15,949 EBITDA $ 27,191 $ 26,891 $ 22,754 Non-cash compensation 1,716 1,433 1,895 Transaction costs / litigation 230 - 105 Impairment of internal-use software 922 - - Adjusted EBITDA $ 30,059 $ 28,324 $ 24,754 Development Financial Operating Capital 2014 13 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Operating Properties (in thousands, except NRSF data) Stabilized Operating NRSF Pre- Office and Light- Stabilized Development Data Center(1) Industrial(2) Total NRSF(5) NRSF(6) Annualized Total Rent Percent Percent Percent Portfolio Market/Facilities ($000)(3) Total Occupied(4) Total Occupied(4) Total(6) Occupied(4) Total Total NRSF Los Angeles One Wilshire Campus LA1* $ 24,298 149,405 75.2 % 4,373 78.4 % 153,778 75.3 % - - 153,778 LA2 14,694 159,617 84.0 7,029 70.8 166,646 83.5 65,296 199,978 431,920 Los Angeles Total 38,992 309,022 79.7 11,402 73.7 320,424 79.5 65,296 199,978 585,698 San Francisco Bay SV1 11,566 84,045 87.5 206,255 80.2 290,300 82.3 - - 290,300 SV2 6,346 76,676 69.8 - - 76,676 69.8 - - 76,676 Santa Clara Campus 22,766 220,676 92.7 71,308 91.5 291,984 92.4 31,497 173,240 496,721 San Francisco Bay Tota 40,678 381,397 86.9 277,563 83.1 658,960 85.3 31,497 173,240 863,697 Northern Virginia VA1 22,802 201,719 77.0 61,050 79.4 262,769 77.6 - - 262,769 VA2 - - - - - - - - 198,000 198,000 DC1* 2,742 22,137 84.0 - - 22,137 84.0 - - 22,137 Northern Virginia Total 25,544 223,856 77.7 61,050 79.4 284,906 78.1 - 198,000 482,906 Boston BO1 13,523 166,026 94.4 19,495 60.5 185,521 90.8 - 87,650 273,171 Chicago CH1 11,504 158,167 86.6 4,946 62.3 163,113 85.9 20,240 - 183,353 New York NY1* 4,927 48,404 69.9 209 100.0 48,613 70.0 - - 48,613 NY2 - - - - - - - 52,692 202,367 255,059 New York Total 4,927 48,404 69.9 209 100.0 48,613 70.0 52,692 202,367 303,672 Miami MI1 1,731 30,176 45.7 1,934 38.6 32,110 45.2 - 13,154 45,264 Denver DE1* 692 4,144 100.0 - - 4,144 100.0 - - 4,144 DE2* 137 5,140 75.4 - - 5,140 75.4 - - 5,140 Denver Total 829 9,284 86.4 - - 9,284 86.4 - - 9,284 Total Facilities $ 137,728 1,326,332 83.0 % 376,599 80.6 % 1,702,931 82.5 % 169,725 874,389 2,747,045 * Indicates properties in which we hold a leasehold interest. (1) Represents the NRSF at each operating facility that is currently occupied or readily available for lease as data center space. Both occupied and available data center NRSF includes a factor to account for a customer’s proportionate share of the 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. (2) Represents the NRSF at each operating facility that is currently occupied or readily available for lease as space other than data center space, which is typically space offered for office or light industrial uses. (3) Represents the monthly contractual rent on stabilized operating NRSF under existing commenced customer leases as of March 31, 2014, 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. On a gross basis, our annualized rent was approximately $144.1 million as of March 31, 2014, which reflects the addition of $6.4 million in operating expense reimbursements to contractual net rent under modified gross and triple-net leases. (4) Includes customer leases that have commenced and are occupied as of March 31, 2014. The percent occupied is determined based on leased square feet as a proportion of total operating NRSF. The percent occupied for data center space, office and light industrial space, and space in total would have been 84.7%, 83.0%, and 84.3%, respectively, if all leases signed in current and prior periods had commenced. (5) Represents pre-stabilized NRSF of projects/facilities which recently have been developed and are in the initial lease-up phase. Annualized rent and NRSF percent occupied for pre-stabilized NRSF is $3.0 million and 15.6%, respectively, as of March 31, 2014. (6) Represents vacant space and entitled land in our portfolio that requires significant capital investment in order to develop into data center facilities as of March 31, 2014. Includes NRSF under construction for which substantial activities are ongoing to prepare the property for its intended use following development. In addition to the amounts above, 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. Development Financial Operating Capital 2014 14 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Leasing Statistics Data Center Leasing Activity GAAP GAAP Leasing Number Total Annualized Annualized Rental Cash GAAP Activity of Leased Rent per Rent Churn Rent Rent Period Leases(1) NRSF(2) Leased NRSF (000’s) Rate(3) Growth(4) Growth(4) New/expansion Q1 2014 119 28,125 $ 134 $ 3,763 leases commenced Q4 2013 109 116,052 41 (5) 4,808 Q3 2013 110 37,243 180 6,688 Q2 2013 121 42,672 147 6,267 Q1 2013 89 39,376 161 6,320 New/expansion Q1 2014 131 39,783 $ 129 $ 5,139 leases signed Q4 2013 122 26,276 132 3,472 Q3 2013 106 23,294 170 3,965 Q2 2013 115 30,810 188 5,782 Q1 2013 110 42,799 119 5,084 Renewal leases Q1 2014 74 22,291 $ 159 $ 3,535 1.2% 4.7% 9.4% commenced Q4 2013 59 50,513 135 6,816 1.9% 3.5% 14.3% Q3 2013 100 29,567 155 4,575 2.7% 6.6% 10.7% Q2 2013 112 44,702 166 7,404 2.0% 2.9% 9.0% Q1 2013 80 47,598 103 4,887 1.1% 2.0% 21.6% (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) Total leased NRSF is determined based on contractually leased square feet for leases that have commenced on or before March 31, 2014. We calculate occupancy based on factors in addition to contractually leased square feet, including required data center support space (such as the mechanical, telecommunications and utility rooms) and building common areas. (3) Rental churn is calculated based on the annualized rental revenue of expired leases terminated in the period, compared with total annualized rental revenue at the beginning of the period. (4) Rent growth represents the increase in rental rates on renewed leases commencing during the period, as compared with the previous rental rates for the same space. (5) 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. Development Financial Operating Capital 2014 15 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Leasing Statistics Lease Expirations (total operating properties, excluding pre-stabilized) Total Annualized Number Operating Percentage Percentage Annualized Annualized Rent Per of NRSF of of Total Annualized of Rent Per Rent at Leased Leases Expiring Operating Rent Annualized Leased Expiration NRSF at Year of Lease Expiration Expiring(1) Leases NRSF ($000)(2) Rent NRSF ($000)(3) Expiration(4) Available as of March 31, 2014(5) - 298,219 17.5 % $ - - % $ - $ - $ - 2014 508 176,977 10.3 26,155 19.0 147.79 27,312 154.33 2015 309 181,370 10.7 31,314 22.7 172.65 32,013 176.51 2016 265 151,414 8.9 21,855 15.9 144.34 25,440 168.02 2017 170 146,490 8.6 22,093 16.0 150.82 28,900 197.28 2018 67 147,842 8.7 15,090 11.0 102.07 18,236 123.35 2019-Thereafter 46 297,212 17.5 14,067 10.2 47.33 22,157 74.55 Office and light industrial (6) 79 303,407 17.8 7,154 5.2 23.58 7,135 23.52 Portfolio Total / Weighted Average 1,444 1,702,931 100.0 % $ 137,728 100.0 % $ 98.05 $ 161,193 $ 114.75 (1) Includes leases that upon expiration will automatically be renewed, primarily on a month-to-month basis. Number of leases represents each agreement with a customer; a lease agreement could include multiple spaces and a customer could have multiple leases. (2) Represents the monthly contractual rent under existing commenced customer leases as of March 31, 2014, 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. (3) Represents the final monthly contractual rent under existing customer leases as of March 31, 2014, multiplied by 12. This amount reflects total annualized base rent before any one-time or non-recurring rent abatements and excludes operating expense reimbursement, power revenue and interconnection revenue. (4) Annualized rent at expiration as defined above, divided by the square footage of leases expiring in the given year. This metric reflects the rent growth inherent in the existing base of lease agreements. (5) Excludes NRSF held for development or under construction. (6) Of the occupied office and light industrial leases, 16,053 NRSF, 5,725 NRSF, 91,154 NRSF, 35,590 NRSF, 4,207 NRSF and 150,678 NRSF are scheduled to expire in 2014, 2015, 2016, 2017, 2018 and 2019 and thereafter, respectively, which accounts for (in thousands) $409, $114, $1,676, $588, $117 and $4,251 of annualized rent scheduled to expire during each respective period. Lease Distribution (total operating properties, excluding pre-stabilized) Total Percentage Percentage Number Percentage Operating of Total Annualized of of of All NRSF of Operating Rent Annualized Square Feet Under Lease(1) Leases(2) Leases Leases(3) NRSF ($000)(4) Rent Available colocation(5) - - % 225,026 13.2 % $ - - % Available office and light-industrial - - 73,192 4.3 - - Colocation NRSF: 5,000 or less 1,316 91.1 434,020 25.4 70,757 51.3 5,001 - 10,000 21 1.5 137,277 8.1 16,371 11.9 10,001 - 25,000 10 0.7 159,724 9.4 25,756 18.7 Greater than 25,000 2 0.1 60,807 3.6 7,269 5.3 Powered shell 16 1.1 309,478 18.2 10,420 7.6 Office and light-industrial 79 5.5 303,407 17.8 7,155 5.2 Portfolio Total 1,444 100.0 % 1,702,931 100.0 % $ 137,728 100.0 % (1) Represents all leases in our portfolio, including data center and office and light industrial leases. (2) Includes leases that upon expiration will automatically be renewed, primarily on a month-to-month basis. Number of leases represents each agreement with a customer; a lease agreement could include multiple spaces and a customer could have multiple leases. (3) Represents the square feet at a building under lease as specified in the lease agreements plus management’s estimate of space available for lease to third parties based on engineers’ drawings and other factors, including required data center support space (such as mechanical, telecommunications and utility rooms) and building common areas. (4) Represents the monthly contractual rent under existing commenced customer leases as of March 31, 2014, multiplied by 12. This amount reflects total annualized base rent before any one-time or non-recurring rent abatements and it excludes power revenue, interconnection revenue and operating expense reimbursement. (5) Excludes NRSF held for development or under construction. Development Financial Operating Capital 2014 16 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Geographic Diversification and 10 Largest Customers Geographic Diversification Miami New York 1.3% (Denver) Percentage of Total 0.6% San 3.6% Metropolitan Market Annualized Rent Chicago Francisco 8.4% Bay San Francisco Bay 29.5 % 29.5% Los Angeles 28.3 Boston Northern Virginia 18.5 9.8% Boston 9.8 Chicago 8.4 New York 3.6 Northern Miami 1.3 Virginia Denver 0.6 18.5% Total 100.0 % Los Angeles 28.3% 10 Largest Customers Weighted Percentage Percentage Average Number Total of Total Annualized of Remaining of Occupied Operating Rent Annualized Lease Term in Customer Industry CoreSite Vertical Locations NRSF(1) NRSF(2) ($000)(3) Rent(4) Months (5) 1 Technology Digital Content 4 54,267 3.2 % $ 10,511 7.6 % 31 2 Technology Cloud 5 126,734 7.4 6,856 5.0 72 Systems Integration & 3 Technology 3 53,014 3.1 6,726 4.9 41 Managed Service Provider 4 Technology Digital Content 9 51,393 3.0 5,535 4.0 11 5 Government * Enterprise 1 141,774 8.3 4,112 3.0 92 6 Technology Cloud 1 27,036 1.6 3,981 2.9 50 7 Financial Enterprise 2 12,184 0.7 3,041 2.2 11 Systems Integration & 8 Technology 1 6,034 0.4 2,646 1.9 10 Managed Service Provider Systems Integration & 9 Managed Services 1 23,663 1.4 2,378 1.7 108 Managed Service Provider 10 Government Enterprise 2 16,764 1.0 2,328 1.7 6 Total/Weighted Average 512,863 30.1 % $ 48,114 34.9 % 43 * Denotes customer using space for general office purposes. (1) Total occupied NRSF is determined based on contractually leased square feet for leases that have commenced on or before March 31, 2014. We calculate occupancy based on factors in addition to contractually leased square feet, including required data center support space (such as the mechanical, telecommunications and utility rooms) and building common areas. (2) Represents the customer’s total occupied square feet divided by the total operating NRSF in the portfolio which, as of March 31, 2014, consisted of 1,702,931 NRSF. (3) Represents the monthly contractual rent under existing commenced customer leases as of March 31, 2014, 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. (4) Represents the customer’s total annualized rent divided by the total annualized rent in the portfolio as of March 31, 2014, which was approximately $137.7 million. (5) Weighted average based on percentage of total annualized rent expiring calculated as of March 31, 2014. Development Financial Operating Capital 2014 17 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Development Summary and Capital Expenditures (in thousands, except NRSF data) Completed Pre-Stabilized Data Center Projects as of March 31, 2014 Percent Projects/Facilities(1) Metropolitan Area Completion NRSF (1) Cost Leased(2) SV4 San Francisco Bay Mar 2013 16,640 $ 13,261 86.6 % LA2 Los Angeles Mar 2013 2,294 320 33.3 LA2 Los Angeles Mar 2013 8,122 871 43.6 LA2 Los Angeles Mar 2013 21,169 8,741 68.8 SV4 San Francisco Bay Apr 2013 14,857 12,911 0.0 CH1 Chicago Apr 2013 20,240 5,098 28.1 NY2 New York Dec 2013 18,103 14,417 75.3 LA2 Los Angeles Feb 2014 33,711 9,800 0.0 NY2 New York Mar 2014 16,484 14,540 0.0 NY2 New York Mar 2014 18,105 14,540 6.8 Total completed pre-stabilized 169,725 $ 94,499 31.7 % (1) These pre-stabilized projects/facilities are excluded from the stabilized operating NRSF information in the Operating Properties table. See Appendix for definition of stabilized and pre-stabilized NRSF. (2) Includes customer leases that have been signed as of March 31, 2014. The percent leased is determined based on leased square feet as proportion of total pre-stabilized NRSF. Data Center Projects Under Construction as of March 31, 2014 Costs Estimated Incurred to- Estimated Projects/Facilities Metropolitan Area Completion NRSF(1) date Total (2) VA2 Northern Virginia Q3/Q4 2014 50,000 $ 38,663 $ 73,500 Total under construction 50,000 $ 38,663 $ 73,500 (1) NRSF reflects management’s estimate based on engineering drawings and required support space and is subject to change based on final demising of the space. (2) Reflects management’s estimate of cost of completion based upon the actual cost at quarter-end, plus management’s estimate of the cost to complete construction. Capital Expenditures — Quarter Ended March 31, December 31, September 30, June 30, March 31, 2014 2013 2013 2013 2013 Data center expansion (1) $ 18,917 $ 46,574 $ 67,688 $ 33,544 $ 47,691 Non-recurring investments (2) 5,714 9,330 3,831 4,526 7,832 Tenant improvements 1,208 2,074 1,578 1,027 1,613 Recurring capital expenditures (3) 1,673 1,612 1,174 935 1,699 Total capital expenditures $ 27,512 $ 59,590 $ 74,271 $ 40,032 $ 58,835 Repairs and maintenance expense (4) $ 2,284 $ 2,665 $ 1,954 $ 1,918 $ 2,016 (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. (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. Development Financial Operating Capital 2014 18 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Market Capitalization and Debt Summary (in thousands, except per share data) Market Capitalization Shares or Market Price / Equivalents Liquidation Value as of Market Value Outstanding March 31, 2014 Equivalents Common shares 21,629 $31.00 $ 670,499 Operating partnership units 25,361 $31.00 786,191 Liquidation value of preferred stock 4,600 $25.00 115,000 Total equity 1,571,690 Total debt 260,000 Total enterprise value $ 1,831,690 Total debt to annualized adjusted EBITDA 2.2x Total debt and preferred stock to annualized adjusted EBITDA 3.1x Debt Summary (1) Outstanding as of: Maturity Maturity Date with March 31, December 31, Instrument Rate Date Extension 2014 2013 Revolving credit facility (2) 2.15% 1/3/2017 1/3/2018 $ 160,000 $ 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 $ 260,000 $ 232,500 Weighted average debt rate 2.57% Preferred Stock 7.25% N/A N/A 115,000 115,000 Total Debt and Preferred Stock $ 375,000 $ 347,500 Floating rate vs. fixed rate debt 62% / 38% 100% / 0% Floating rate vs. fixed rate debt and preferred stock 43% / 57% 67% / 33% (1) See the most recent 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 March 31, 2014, plus applicable spread. (3) Represents the effective interest rate as a result of the interest rate swap agreement associated with $100 million 1 month LIBOR variable rate debt. Debt Maturities $300,000 $250,000 $200,000 $150,000 $100,000 $50,000 $- 2014 2015 2016 2017 2018 2019 Development Financial Operating Capital 2014 19 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 Interest Summary and Debt Covenants (in thousands) Interest Expense Components Three Months Ended March 31, December 31, March 31, 2014 2013 2013 Interest expense and fees $ 1,762 $ 1,652 $ 962 Amortization of deferred financing costs 580 446 420 Capitalized interest (1,169) (1,339) (943) Total interest expense $ 1,173 $ 759 $ 439 Percent capitalized 49.9% 63.8% 68.2% Debt Covenants Revolving Credit Facility & Senior Unsecured Term Loan March 31, December 31, September 30, June 30, March 31, Required Compliance 2014 2013 2013 2013 2013 Fixed charge coverage ratio Greater than 1.75x 7.8x 7.2x 7.5x 7.7x 7.6x Total indebtedness to gross asset value Less than 60% 15.6% 15.5% 11.5% 10.0% 9.6% Secured debt to gross asset value Less than 40% 0.0% 3.7% 3.8% 4.0% 4.2% Unhedged variable rate debt to gross asset value Less than 30% 9.3% 14.9% 10.8% 9.0% 7.9% Facility availability $405,000 $405,000 $405,000 $405,000 $355,000 Borrowings outstanding (160,000) (174,250) (108,000) (73,000) (52,000) Outstanding letters of credit (8,390) (8,390) (8,390) (7,540) (8,540) Current availability $236,610 $222,360 $288,610 $324,460 $294,460 Development Financial Operating Capital 2014 20 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 2014 Guidance (in thousands, except per share amounts ) 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: Low High Net income attributable to common shares $ 0.50 $ 0.60 Real Estate depreciation and amortization 1.50 FFO $ 2.00 $ 2.10 Projected operating results: Total operating revenues $ 260,000 $ 270,000 Data center revenue $ 255,000 $ 265,000 General and administrative expenses $ 28,000 $ 30,000 Adjusted EBITDA $ 120,000 $ 125,000 Guidance drivers: Rental churn rate per quarter 1% 2% Cash rent growth on data center renewals 1% 4% Capital expenditures: Data center expansion $ 90,000 $ 105,000 Non-recurring investments $ 15,000 $ 20,000 Tenant improvements $ 5,000 $ 10,000 Recurring capital expenditures $ 5,000 $ 10,000 Total capital expenditures $ 115,000 $ 145,000 Development Financial Operating Capital 2014 21 Overview and Capital Appendix Statements Portfolio Structure Guidance Expenditures

 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. Turn-Key Same Store Includes turn-key data center space that was leased and available to be leased to our colocation customers as of December 31, 2012, 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, 2012. The turn-key same store space as of December 31, 2012, is 949,300 NRSF. 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. Stabilized and pre-stabilized NRSF Projects and facilities that have been recently developed and are in the initial lease-up phase are classified as pre-stabilized NRSF until they reach 85% occupied 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. Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix

 Appendix 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 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. 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. Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 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: 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 adjustments Less: Above and below market leases Less: Maintenance capital investment Less: Tenant improvement capital investment Less: Capitalized leasing commissions 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 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. Overview Financial Statements Operating Portfolio Development and Capital Expenditures Capital Structure 2014 Guidance Appendix