Organization and Description of Business

9 Months Ended

Sep. 30, 2013

Organization and Description of Business

Organization and Description of Business

1. Organization and Description of Business

CoreSite Realty Corporation, through its controlling interest in CoreSite, L.P. (the “Operating Partnership”) and the subsidiaries of the Operating Partnership (collectively, the “Company,” “we,” or “our”), is a fully-integrated, self-administered, and self-managed real estate investment trust (“REIT”). The Company was organized in the State of Maryland on February 17, 2010, completed its initial public offering of common stock (the “IPO”) on September 28, 2010, and is the sole general partner of the Operating Partnership. As of September 30, 2013, the Company owns a 45.1% common interest in the Operating Partnership.

We are engaged in the business of owning, acquiring, constructing and managing technology-related real estate and as of September 30, 2013, our property portfolio included 14 operating data center facilities and multiple development projects located in some of the largest and fastest growing data center markets in the United States, including Los Angeles, the San Francisco Bay and Northern Virginia areas, Chicago, Boston, New York City, Miami and Denver. The development projects include construction of new facilities in the San Francisco Bay, Northern Virginia and New York areas.