Press Release

Microsoft Azure ExpressRoute Now Available Across Seven CoreSite Markets

Direct connectivity now available in Northern Virginia, Chicago and Silicon Valley

Denver, CO – August 21, 2017 – CoreSite Realty Corporation (NYSE: COR), a premier provider of secure, reliable, high-performance data center and interconnection solutions across the U.S., today announced the expanded availability of Microsoft Azure Express Route, which can now be privately accessed from seven of CoreSite’s markets across the country, including Northern Virginia, Chicago, Silicon Valley, Denver, Los Angeles, New York, and Boston.

CoreSite customers can privately connect to Microsoft Azure, Office 365 and Dynamics 365 via the CoreSite Open Cloud Exchange, which provides high-performance, SLA-backed virtual connections and on-demand provisioning. The integration of Azure ExpressRoute and the CoreSite Open Cloud Exchange provides CoreSite customers with the opportunity to establish a fast and reliable private connection into Microsoft Azure, Office 365 and Dynamics 365. With an Azure ExpressRoute connection, customers have a natural extension of their data centers and can build hybrid applications that span on-premises infrastructure and Microsoft Cloud services without compromising privacy or performance.

CoreSite customers can efficiently transfer large data sets for high-performance computing, migrate virtual machines between dev-test environments in Azure to production environments housed in a CoreSite data center and optimize replication for business continuity, disaster recovery, and other high-availability strategies.

“We are excited to announce the expanded availability of Microsoft Azure ExpressRoute connectivity to our customers across seven of our key markets,” said Brian Warren, Senior Vice President of Engineering & Product at CoreSite. “We are enabling our customers with the solutions necessary to bring together all of their applications, data, devices, and resources, both on-premise and in the cloud, with predictable, reliable and secure high-throughput connections.”

About CoreSite

CoreSite Realty Corporation (NYSE:COR) delivers secure, reliable, high-performance data center and interconnection solutions to a growing customer community across eight key North American markets. More than 1,200 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 450+ 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 Media Contact

Greer Aviv
VP, Investor Relations and Corporate Communications
+1 303.405.1012
+1 866.777.CORE
greer.aviv@coresite.com

Forward Looking Statements

This press release 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 CoreSite'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; CoreSite's failure to obtain necessary outside financing; CoreSite'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 CoreSite's good faith beliefs, assumptions and expectations, but they are not guarantees of future performance. Furthermore, CoreSite 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 CoreSite's future results to differ materially from any forward-looking statements, see the section entitled "Risk Factors" in CoreSite's most recent annual report on Form 10-K, and other risks described in documents subsequently filed by CoreSite from time to time with the Securities and Exchange Commission.