COSTAR GROUP INC

As of January 21, 2025, we have relocated our headquarters to our owned building at 1201 Wilson Blvd in Arlington, Virginia, occupying approximately 160,000 square feet. We exited our previous headquarters located at 1331 L Street, NW, in downtown Washington, D.C., with a lease that expires on May 31, 2025. Our headquarters is used primarily by our North America operating segment. Our principal facility in the U.K. is located in London, where we occupy 42,000 square feet of office space. Our lease for this facility has a term ending August 31, 2025. As part of a workforce consolidation, we signed a lease for a total of approximately 52,000 square feet in London and have begun relocating employees to the new building. These facilities are used by our International operating segment, including our recent acquisition, OnTheMarket.

Our staff in Richmond, Virginia is located in an owned building at 501 S 5th Street, where we occupy approximately 310,000 square feet, an owned building located at 901 Semmes Avenue, where we occupy approximately 117,000 square feet; and leased space at 951 E Byrd St., where we occupy approximately 135,000 square feet. These locations primarily house research, product development, and sales functions. All of our owned properties are held under fee simple ownership and are not materially encumbered.

We also operate certain of our research, development, and sales functions out of additional leased office spaces in Irvine, California; San Diego, California; and Atlanta, Georgia. Additionally, we lease office space in a variety of other metropolitan areas. These locations include, among others, the following: Nashville, Tennessee; Norfolk, Virginia; Boston, Massachusetts; New York, New York; San Francisco, California; and Los Angeles, California.

We believe these facilities are suitable and appropriately support our business needs.