Paramount Group, Inc. is a fully-integrated REIT focused on owning, operating, managing, acquiring and redeveloping high-quality, Class A office properties in select central business district submarkets of New York City, Washington, D.C. and San Francisco. All references to "we," "us," "our," the "Company" and "Paramount" refer to Paramount Group, Inc., a Maryland corporation, and its consolidated subsidiaries, including Paramount Group Operating Partnership LP (the "Operating Partnership"), a Delaware limited partnership. We conduct our business through, and substantially all our interests in properties and investments are held by, the Operating Partnership. We are the sole general partner of, and owned approximately 90.3% of the Operating Partnership as of December 31, 2018. As of December 31, 2018, our portfolio consisted of 12 Class A office properties aggregating approximately 11.9 million square feet that was 97.0% leased and 95.1% occupied.
We believe that we distinguish ourselves from other owners and operators of office properties through the following competitive strengths:
• Premier Portfolio of High-Quality Office Properties in the Most Desirable Submarkets. We have assembled a premier portfolio of Class A office properties located exclusively in carefully selected submarkets of New York City, Washington, D.C. and San Francisco. Our submarkets are among the strongest commercial real estate submarkets in the United States for office properties due to a combination of their high barriers to entry, constrained supply, strong economic characteristics and a deep pool of prospective tenants in various industries that have demonstrated a strong demand for high-quality office space. Our markets are international business centers, characterized by a broad tenant base with a highly educated workforce, a mature and functional transportation infrastructure and an overall amenity rich environment. These markets are home to a diverse range of large and growing enterprises in a variety of industries, including financial services, media and entertainment, consulting, legal and other professional services, technology, as well as federal government agencies. As a result of the above factors, the submarkets in which we are invested have generally outperformed the broader markets in which they are located.