41 C.F.R. § 102-83.85 What is a central business area?
Title 41 - Public Contracts and Property Management
Central business area (CBA) means the centralized community business area and adjacent areas of similar character, including other specific areas that may be recommended by local officials in accordance with Executive Order 12072. The CBAs are designated by local government and not by Federal agencies.
Title 41: Public Contracts and Property Management
PART 102–83—LOCATION OF SPACE
Subpart B—Location of Space
Urban Areas
§ 102-83.85 What is a central business area?

