CoreSite Realty Corporation Declares Dividend on Common Stock

Fourth Quarter Dividend of $1.10 per share reflects 12% increase year
over year

DENVER–(BUSINESS WIRE)–CoreSite Realty Corporation (NYSE: COR), a premier provider of secure,
reliable, high-performance data center and interconnection solutions
across the U.S., today announced a cash dividend of $1.10 per share on
common stock and common stock equivalents for the fourth quarter of 2018.

The dividend will be paid on January 15, 2019, to shareholders of record
as of December 31, 2018. The current dividend reflects an increase of
6.8% over the prior quarter dividend of $1.03, and a 12.2% increase over
the dividend of $0.98 in the fourth quarter 2017.

“We are pleased to be able to again increase cash returns to our
shareholders as a result of the growth in our cash flows generated from
operations,” said Jeff Finnin, Chief Financial Officer of CoreSite.

ABOUT CORESITE

CoreSite Realty Corporation (NYSE: COR) delivers secure, reliable,
high-performance data center and interconnection solutions to a growing
customer ecosystem across eight key North American markets. More than
1,350 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.

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: any adverse developments in local economic
conditions or the demand for data center space in these markets;
operational difficulties, including difficulties relating to information
systems, internal processes and information security; significant
industry competition; financial market fluctuations; 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.

Contacts

CoreSite Realty Corporation
Carole Jorgensen, 303-405-1012
Vice
President of Investor Relations and Corporate Communications
Carole.Jorgensen@CoreSite.com