City of Washington, DCAll applicants for a Basic Business License operating from a commercial location in the District of Columbia must provide a Certificate of Occupancy (C of O) for the premise address from which the business activity is conducted in order to demonstrate the activity does not conflict with building and zoning codes. A certificate of occupancy is needed to occupy any structure other than a single family dwelling. To include the following uses: two family flat, apartment house, and all commercial uses.ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/fbc9363a728d4c008eeb98f9ac62a35a_46engOpen Data DCPublicCertificate of Occupancy [District of Columbia--Washington]Web servicesDistrict of Columbia--WashingtonDistrict of ColumbiaLast Modified: 2026-01-06