D.C. Mun. Regs. tit. 11, r. 11-E303
Except as specified elsewhere in this section, the maximum permitted height of buildings or structures and any additions thereto not including the penthouse or rooftop structure, in an RF-1 zone shall not exceed thirty-five feet (35 ft.) and three (3) stories.
New construction of three (3) or more immediately adjoining residential row dwellings or flats, built concurrently on separate record lots, shall be permitted a maximum building height of forty feet (40 ft.) and three (3) stories.
A building or other structure may be erected to a height not exceeding forty feet (40 ft.) if approved by the Board of Zoning Adjustment as a special exception under Subtitle X, Chapter 9, subject to Subtitle E § 5203.
The maximum permitted building height for a place or worship, not including the penthouse or rooftop structure, in the RF-1 zone shall be sixty feet (60 ft.) and three (3) stories.
A building or other structure may be erected to a height not exceeding ninety feet (90 ft.), not including the penthouse or rooftop structure; provided that the building or structure shall be removed from all lot lines of its lot for a distance equal to the height of the building or structure above the adjacent natural or finished grade, whichever is the lower in elevation.
An institutional building or structure may be erected to a height not exceeding ninety feet (90 ft.), not including the penthouse or rooftop structure; provided, that the building or structure shall be removed from all lot lines of its lot a distance of not less than one foot (1 ft.) for each foot of height in excess of that authorized in the zone in which it is located.
The maximum permitted height of a penthouse or rooftop structure, except as permitted in Subtitle E § 303.8, and as limited in Subtitle C § 1501 on the roof of a detached dwelling, semi-detached dwelling, rowhouse, flat, or apartment house converted pursuant to Subtitle U § 320.2 shall be twelve feet (12 ft.) and one (1) story.
A non-residential building constructed pursuant to Subtitle E §§ 303.4 through 303.6 shall be permitted a mechanical penthouse of eighteen feet six inches (18 ft. 6 in.) in height maximum.
D.C. Mun. Regs. tit. 11, r. 11-E303