Below are the statistics summary concerning GSA's owned and leased Historic Building inventory as of May 2008.

Size of GSA Historic Buildings (Government-Owned) Inventory
438 historic buildings listed, formally determined eligible, and likely to be determined eligible based on age and other criteria for inclusion in the National Register of Historic Places.

• Historic buildings provide approximately one fourth (25%) of GSA's federally owned space
• Occupiable: 34 million s.f.
• Rentable: 47 million s.f.
• Gross: 53 million s.f.

National Register of Historic Place (Government-Owned Inventory):

• 252 buildings listed in the National Register
• 64 National Historic Landmarks (highest category of importance in the National Register)

Leases in Historic Buildings:

• GSA leases space in approximately 50 historic buildings
• Non-federally owned historic buildings provide more than 2.7 million square feet leased by GSA

GSA's Largest Historic Buildings Leases:

• Postal Square, Washington, DC: 785,000 s.f.
• Wanamaker Building, Philadelphia, PA: 414,000 s.f.
• Average (mean) GSA historic buildings lease: 31,000 s.f.
• Typical (median) GSA historic buildings lease: 16,000 s.f.

Top Federal Agencies Leasing Space in Historic Buildings through GSA:

• U.S. Courts
• General Services Administration
• Social Security Administration
• Health and Human Services
• Justice Department
• Internal Revenue Service