D.C. Mun. Regs. tit. 19, r. 19-1041
No vessel that is used, or is intended for use, as a show boat, restaurant, floating night club, or other place of amusement may anchor or operate in District of Columbia waters, or tie up to any wharf or other place in District of Columbia waters, without prior approval of the Mayor.
Vessels obtaining permission to operate under § 1041.1 shall comply with all applicable federal and District of Columbia laws and regulations.
In making decisions governing the operation or anchoring of vessels described in this section, the Mayor shall comply with the D.C. Administrative Procedure Act.
Except as otherwise provided by the Mayor by regulation, no vessel or floating construction that is anchored or moored in District of Columbia waters, or that is docked or berthed at any of the wharves, piers, bulkheads, or other works on any part of the waterfront properties adjacent to any waters under the jurisdiction of the District of Columbia, shall be used for multi-family dwelling purposes.
D.C. Mun. Regs. tit. 19, r. 19-1041