CoreSite Amends and Increases Revolving Credit Facility

  CoreSite Amends and Increases Revolving Credit Facility

 Amendment converts the facility to unsecured, increases availability to $355
          million, extends the maturity, and lowers the rate spread

Business Wire

DENVER -- January 7, 2013

CoreSite Realty Corporation (NYSE: COR), a national provider of powerful,
network-rich data centers, today announced that its operating partnership,
CoreSite, L.P., has amended and restated its revolving credit facility, which
was scheduled to mature on December 15, 2014. The amendment was completed with
its existing lender group and new bank relationships.

The new credit facility is unsecured, compared to the prior facility, which
was secured by five assets, and availability has been increased from $225.0
million to $355.0 million. The facility has a five-year term through January
2018, including a one-year extension option, and the interest rate spread was
reduced by 25 basis points. CoreSite intends to use the facility primarily to
fund expansion and development projects.

Jeff Finnin, CoreSite’s Chief Financial Officer, commented, “We are pleased
with the enhanced financial flexibility and cost savings that the amended
facility provides CoreSite as we continue to pursue our growth objectives. The
move to unsecured debt, as well as the size and term of the facility, signals
our lending group’s confidence in our operating model and we appreciate their
ongoing support.”

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.

Forward Looking Statements

This 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 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.

Contact:

CoreSite Investor Relations Contact
+1 303.222.7276
InvestorRelations@CoreSite.com
or
CoreSite Media Contact
Jeannie Zaemes | CoreSite Marketing Senior Director
+1 720.446.2006 | +1 866.777.CORE
Jeannie.Zaemes@CoreSite.com