Post 200 The guide to the region's top businesses

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A field photographer conducts research for the CoStar Group, a company that aggregates information about the commercial real estate industry. (Courtesy of CoStar Group)

Public companies and financial services

CoStar Group

The commercial real estate data firm made two big splashes in 2011. In February, it sold its D.C. headquarters building just a year after buying it, for a $60 million profit. The buyer, GLL Real Estate Partners of Germany, leased the building back to CoStar. The deal marked the the most profitable flip of Washington commercial real estate from the recession to date. In April, CoStar announced plans to acquire data competitor LoopNet in a deal valued at $860 million.


CoStar logs more than 5.1 million data changes per day to its commercial real estate databases.

1331 L St. NW

Washington D.C., 20005


Founded: 1987

President and CEO: Andrew C. Florance

Revenue: $226260

Assets: $439650

Employees (local): 1532 (754)

NOTE: Our methodology for the rankings.