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 CoreSite Realty Corporation COR, a premier provider of secure, 
 reliable, high-performance <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.coresite.com%2Fdata-centers&amp;esheet=51564614&amp;newsitemid=20170525005061&amp;lan=en-US&amp;anchor=data+center&amp;index=1&amp;md5=995aa964f9cc70802dbe240a1816f48f" rel="nofollow" rel="nofollow">data 
 center</a> and <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.coresite.com%2Fsolutions%2Finterconnection&amp;esheet=51564614&amp;newsitemid=20170525005061&amp;lan=en-US&amp;anchor=interconnection&amp;index=2&amp;md5=8a559662e55deff9aef25fb86be80d97" rel="nofollow" rel="nofollow">interconnection</a> 
 solutions across the U.S., today announced that Ariento, a company that 
 specializes in cybersecurity and IT solutions for small businesses, has 
 chosen CoreSite as its data center solution partner, deploying within 
 CoreSite&#39;s <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.coresite.com%2Fdata-centers%2Flocations%2Fsilicon-valley%2Fsv4&amp;esheet=51564614&amp;newsitemid=20170525005061&amp;lan=en-US&amp;anchor=Santa+Clara&amp;index=3&amp;md5=99b645f57614a9fdc2ff9ed4485139b5" rel="nofollow" rel="nofollow">Santa 
 Clara</a> data center campus.
 
 
 Ariento is a service-disabled veteran-owned company with over 30 years 
 of experience in cybersecurity for various military branches and 
 organizations. Ariento provides its customers with an IT solution that 
 not only protects their businesses, but also helps to balance the needs 
 of security and convenience. As a business that provides IT security for 
 small businesses and organizations, the physical security at CoreSite's 
 Santa Clara campus provided Ariento with a level of comfort that was 
 unmatched amongst other data center operators. Across its portfolio, 
 CoreSite directly employs experienced security officers at each of its 
 facilities, adding a layer of accountability to the protection of its 
 customers' mission-critical business applications.
 
 
 Ariento also chose to deploy in CoreSite's Santa Clara campus based on 
 the proximity to markets that Ariento serves, and to reliably support 
 the growth in its client base with a more advanced architecture that 
 could meet the performance requirements created by this growth, 
 specifically decreasing the latency to public cloud service providers 
 such as <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.coresite.com%2Fsolutions%2Fcloud-services%2Fpublic-cloud-providers%2Famazon-web-services-direct-connect&amp;esheet=51564614&amp;newsitemid=20170525005061&amp;lan=en-US&amp;anchor=AWS+Direct+Connect&amp;index=4&amp;md5=40f73853f08745d7306b30a5f54064da" rel="nofollow" rel="nofollow">AWS 
 Direct Connect</a>.
 
 
 "Throughout the process, CoreSite was extremely responsive as well as 
 transparent, and as a small business, these are areas in which we too 
 strive to succeed," said Aaron Hanke, Partner at Ariento. "It is this 
 experience that gives us confidence that this will be a long-term 
 partnership that permits Ariento to better service its clients from both 
 a security and performance perspective.&#34;
 
 
 The CoreSite Silicon Valley market is comprised of seven operational 
 data centers, providing colocation solutions to one of the largest 
 concentrations of Internet and technology companies in the world. More 
 than 185 international and national carriers, social media companies, 
 cloud computing providers, media and entertainment firms, and enterprise 
 customers connect to do business in CoreSite's Silicon Valley data 
 center market.
 
 
 "We are pleased to welcome Ariento to our Santa Clara campus, which is 
 home to a dynamic community of enterprise and digital content companies, 
 cloud and IT service providers, and network providers,&#34; said Maile 
 Kaiser, Vice President of Sales at CoreSite. &#34;Our network and 
 interconnection-dense environment will provide Ariento the capability to 
 take its business to the next level and we look forward to supporting 
 its future growth."
 
 
 About Ariento
 
 
 Ariento is a service-disabled military veteran-owned company with over 
 30 years of experience in cybersecurity and information technology (IT) 
 services. Whether it has been with the Department of Defense, Marine 
 Corps, or National Guard, their team has provided answers to the growing 
 threat of cyber-attacks and data breaches on behalf of their nation, its 
 businesses and organizations as well as individuals. To learn more about 
 Ariento, visit: <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.Ariento.com&amp;esheet=51564614&amp;newsitemid=20170525005061&amp;lan=en-US&amp;anchor=www.Ariento.com&amp;index=5&amp;md5=8990997a3fe3c33a15dd51315b2d778a" rel="nofollow" rel="nofollow">www.Ariento.com</a>.
 
 
 About CoreSite
 
 
 CoreSite Realty Corporation COR delivers secure, reliable, 
 high-performance data center and interconnection solutions to a growing 
 customer ecosystem across eight key North American markets. More than 
 1,000 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 400+ 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 <a xmlns="http://www.w3.org/1999/xhtml" href="http://cts.businesswire.com/ct/CT?id=smartlink&amp;url=http%3A%2F%2Fwww.CoreSite.com&amp;esheet=51564614&amp;newsitemid=20170525005061&amp;lan=en-US&amp;anchor=www.CoreSite.com&amp;index=6&amp;md5=c3fa0d9a3bac3d878cee4e77d13fbec3" rel="nofollow" rel="nofollow">www.CoreSite.com</a>.
 
 
 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 &#34;believes,&#34; &#34;expects,&#34; &#34;may,&#34; &#34;will,&#34; &#34;should,&#34; 
 &#34;seeks,&#34; &#34;approximately,&#34; &#34;intends,&#34; &#34;plans,&#34; &#34;pro forma,&#34; &#34;estimates&#34; 
 or &#34;anticipates&#34; 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&#39;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&#39;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&#39;s future results to differ materially 
 from any forward-looking statements, see the section entitled &#34;Risk 
 Factors&#34; in CoreSite&#39;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.
 
 
 
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