D.C. Code § 6-808
Whenever the Mayor finds that any building or part of a building, staging, or other structure, or anything attached to or connected with any building or other structure or excavation shall cause a building to be unsafe for human occupancy, he shall give notice of such fact to the owner or other person having an interest in such building, and to the occupant or occupants thereof. If, within the period of time specified in the notice, the building or part thereof has not been made safe for human occupancy, the Mayor may order the use of such building or part thereof discontinued until it has been made safe; provided, that if in the opinion of the Mayor the unsafe condition of the building or part thereof is such as to be imminently dangerous to the life or limb of any occupant, the Mayor may order the immediate discontinuance of the use of such building or part thereof. Any person occupying, or permitting the occupancy of, such building or part thereof in violation of such order of the Mayor shall be fined not more than $300 or imprisoned for not more than 30 days. Civil fines, penalties, and fees may be imposed as alternative sanctions for any infraction by any person occupying, or permitting the occupancy of, a building or part thereof in violation of the order of the Mayor, pursuant to Chapter 18 of Title 2. Adjudication of any infraction shall be pursuant to Chapter 18 of Title 2.
D.C. Code § 6-808
Housing conversion and sale, fund for housing assistance, authorized uses, displaced tenants, see § 42-3403.07. .