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24/7 Extends Its Dark Fiber Backbone Into CoreSite's Washington, D.C. Data Center

  24/7 Extends Its Dark Fiber Backbone Into CoreSite's Washington, D.C. Data
                                    Center

CoreSite customers gain expanded interconnectivity throughout Mid-Atlantic
region

PR Newswire

DENVER, May 2, 2013

DENVER, May 2, 2013 /PRNewswire/ --CoreSite Realty Corporation (NYSE: COR),
premier provider of network-dense, cloud-enabled data centers and the CoreSite
Mesh, today announced that 24/7 Mid-Atlantic Network has agreed to extend its
dark fiber backbone into CoreSite's DC1 facility in downtown Washington, D.C.
The agreement will provide CoreSite customers with new interconnectivity
opportunities to carriers, service providers, and enterprises throughout the
Mid-Atlantic region.

24/7 Mid-Atlantic provides custom, high-capacity transport and network
solutions—including metro dark fiber, wireless backhaul, last mile transport,
private fiber networks and carrier-neutral colocation—to customers across the
Baltimore; Washington, D.C. metro; Northern Virginia; and Delmarva Peninsula
areas. This new relationship expands 24/7's interconnectivity capabilities to
CoreSite's broad customer base and provides 24/7 customers with access to the
CoreSite Mesh, the company's highly interconnected fabric of dynamic capacity,
connectivity, and community.

"We have been working closely with CoreSite to ensure that our presence at DC1
provides our customers with the most diverse and optimal interconnectivity
options possible," said Christopher Morris, president and chief operations
officer, 24/7 Mid-Atlantic Network. "Our strategic relationship with CoreSite
will enable our customers to significantly expand their reach throughout our
network footprint and gain access to CoreSite's Mesh community."

"Customers join our community because of the diverse range of interconnection
opportunities we provide," said Jarrett Appleby, chief operating officer,
CoreSite. "It is a critical part of what we offer through the CoreSite Mesh.
Today's agreement with 24/7 expands the interconnection choices that we
deliver to our customers and enables them to extend their reach and expand
business opportunities throughout the U.S. Mid-Atlantic region."

24/7 Mid-Atlantic Network

24/7 Mid-Atlantic Network is a high-capacity transport and fiber network
provider serving the Baltimore; Washington, D.C. metro; Northern Virginia; and
Delmarva Peninsula areas. The company designs, constructs, and manages custom
fiber networks for carriers, service providers, enterprise, and government
organizations throughout the region. 24/7 offers a wide variety of network
configurations including ringed, point-to-point, point-to-multipoint, and mesh
topologies. 24/7 Mid-Atlantic Network additionally provides major data and
telecommunication carriers with high quality network solutions through its
carrier-neutral colocation facility. For more information, visit
www.247MidAtlantic.com or follow us on Twitter @247MidAtlantic.

About CoreSite

CoreSite Realty Corporation (NYSE: COR) is the data center provider chosen by
more than 750 of the world's leading carriers and mobile operators, content
and cloud providers, media and entertainment companies, and global enterprises
to run their performance-sensitive applications and to connect and do
business. CoreSite propels customer growth and long-term competitive advantage
through the CoreSite Mesh by connecting the Internet, private networking,
mobility, and cloud communities within and across its 14 high-performance data
center campuses in nine markets in North America. With direct access to 275+
carriers and ISPs, over 180 leading cloud and IT service providers, intersite
connectivity, and the nation's first Open Cloud Exchange that provides access
to thousands of lit buildings and multiple key cloud on-ramps, CoreSite
provides easy, efficient and valuable gateways to global business
opportunities. For more information, visit www.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; significant industry competition; CoreSite's failure to
obtain necessary outside financing; and other factors affecting the real
estate and telecommunications industries 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.

SOURCE CoreSite Realty Corporation

Website: http://www.coresite.com
Contact: Jeannie Zaemes | CoreSite Marketing Senior Director, +1 720.446.2006
| +1 866.777.CORE, Jeannie.Zaemes@CoreSite.com