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Sidera to Provide High-Capacity Connectivity Between CoreSite Data Centers

  Sidera to Provide High-Capacity Connectivity Between CoreSite Data Centers

Sidera Connects Customers to CoreSite's Robust Application and Cloud Services
Ecosystems

PR Newswire

DENVER and NEW YORK, Nov. 12, 2012

DENVER and NEW YORK, Nov. 12, 2012 /PRNewswire/ --CoreSite Realty Corporation
(NYSE: COR), a national provider of powerful, network-rich data centers, and
Sidera networks, the premier supplier of fiber optic-based network solutions,
announced that Sidera is providing connectivity between CoreSite data centers
located in critical communications markets including Chicago; Boston; New
York; Washington, DC; and Reston, VA. Sidera's high capacity network will
support the requirements of CoreSite's financial services, content delivery,
web services, media and entertainment, and other high-bandwidth customers by
providing the redundancy, diversity, and scalability required to effectively
run performance-sensitive applications deployed in CoreSite's data centers.

Sidera Networks is the leading provider of tailored, high-capacity
communications services to both carrier and large enterprise customers. Sidera
Networks offers a comprehensive suite of facilities-based services, including
Ethernet, SONET, wavelength, dark fiber, and internet access.

Connecting through the Sidera network gives CoreSite customers immediate
access to over 40 financial exchanges and the Sidera Xtreme Ultra-Low Latency
Network, which was specifically designed for applications demanding the lowest
latency and highest performance.

Additionally, as a result of the expansion into additional CoreSite data
centers, Sidera will extend peering on CoreSite's Any2 exchange, the nation's
second largest peering exchange. Sidera also will be able to provide seamless
access to CoreSite's Open Internet Exchange, an aggregation hub that gives
expanded peering and interconnection opportunities to CoreSite customers.

"CoreSite has developed a successful model of attracting the largest content
players, service providers, and end-customers and connecting them together at
key exchange points around the country," said Jarrett Appleby, COO, CoreSite.
"This strategy relies on our selection of key fiber providers like Sidera to
deliver high-performance networks for our customers' applications."

"Sidera is proud to be a part of CoreSite's ecosystems," said Clint Heiden,
President, Sidera Networks. "Connecting multiple CoreSite facilities to our
network ensures that our mutual customers will have diverse and scalable
access to strategic data center resources, from carrier interconnection to
cloud services to space, power, and storage."

For further information on CoreSite, visit www.coresite.com or call
303-405-1000. Learn more about Sidera at www.sidera.net or call 877.669.6366.

About CoreSite

CoreSite Realty Corporation (NYSE: COR) is a national provider of data center
products and interconnection services. More than 750 customers such as Global
1000 enterprises, communications providers, cloud and content companies,
financial firms, media and entertainment, healthcare, and government agencies
choose CoreSite for the confidence that comes with customer-focused data
center products, service and support systems, and scalability. CoreSite's
network-centric computing platform is a business catalyst, featuring the Any2
Internet exchange and network ecosystems, which include access to 225+
carriers and service providers and a growing mesh of more than 15,000
interconnections. The company features a diverse colocation offering from
individual cabinets to custom cages and private suites, with 14 data center
locations in nine major U.S. markets. For more information, visit
www.CoreSite.com.

About Sidera Networks

Sidera Networks, LLC (www.sidera.net), is the premier provider of tailored,
high capacity communications services to carrier and enterprise customers.
Sidera Networks offers a comprehensive suite of facilities-based services
including: Ethernet, SONET, Wavelength, Dark Fiber, Internet Access,
Colocation and more. With a fiber optic network leveraging unique
rights-of-way that delivers connectivity to the major metropolitan areas from
Maine to Virginia and out to Chicago, as well as access to Toronto and London,
Sidera is committed to delivering cost-effective, custom solutions coupled
with superior industry expertise, service and support.

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 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 our 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.

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; or Joe Cumello, Sidera Marketing
Vice President, +1-703-434-8275, Joe.Cumello@Sidera.com