It offers CoStar Property Professional that provides inventory of office, industrial, retail, and multifamily, and student housing properties and land; CoStar COMPS Professional, which covers comparable commercial real estate sales information; CoStar Market Analytics to view and report on aggregated market and submarket trends; and CoStar Tenant, an online business-to-business prospecting and analytical tool that provides tenant information.

The company also provides CoStar Lease Comps, a tool to capture, manage, and maintain lease data; CoStar Lease Analysis, a workflow tool; CoStar Public Record, a searchable database of commercially-zoned parcels; CoStar Real Estate Manager, a real estate and asset management, and lease accounting software; and CoStar Risk Analytics and CoStar Investment Analysis that provides market research, consulting and analysis, portfolio and debt analysis, and management and reporting services, as well as STAR Report that offers benchmarking and analytics services.

In addition, it offers apartment marketing sites, such as Apartments.com, ApartmentFinder.com, ForRent.com, ApartmentHomeLiving.com, Apartamentos.com, AFTER55.com, CorporateHousing.com, ForRentUniversity.com, Westside Rentals, and Off Campus Partners; LoopNet Premium Lister; LoopNet Diamond, Platinum, and Gold Ads; LandsofAmerica, LandAndFarm, and LandWatch for rural land for-sale; BizBuySell.com, BizQuest.com, and FindaFranchise.com for operating businesses and franchises for-sale; Ten-X, an online auction platform for commercial real estate; and HomeSnap, an online and mobile software platform. The company was founded in 1987 and is headquartered in Washington, the District of Columbia.

Costar Group reported 3rd Quarter September 2021 earnings of $0.25 per share on revenue of $499.3 million. The consensus earnings estimate was $0.23 per share on revenue of $497.5 million. Revenue grew 17.3% on a year-over-year basis.

The company said it expects fourth quarter non-GAAP earnings of $0.29 to $0.30 per share. The current consensus earnings estimate is $0.29 per share for the quarter ending December 31, 2021.