D.C. Mun. Regs. tit. 11, r. 11-G602
In the MU-IO/FT zone, the maximum building height, including a penthouse or rooftop structure, shall be sixty-five feet (65 ft.).
In the MU-IO/FT zone, a building may be erected to a height of eighty feet (80 ft.) or ninety feet (90 ft.) for Inclusionary Developments, including a penthouse or rooftop structure, subject to the provision of special architectural features, roof parapet detailing, and design consideration of penthouses and rooftop structures to ensure that the views and vistas from the historic fortification of Fort Totten are not degraded or obstructed. Prior to the issuance of a building permit, the Office of Planning shall review and provide a written report with recommendation on the building's satisfaction of this requirement to the Zoning Administrator.
D.C. Mun. Regs. tit. 11, r. 11-G602