D.C. Mun. Regs. tit. 11, r. 11-C1005
Where the set-aside requirement of Subtitle C § 1003 (excluding any set-aside requirement satisfied by providing a contribution to a housing trust fund pursuant to Subtitle C § 1006.10) is eight hundred fifty (850) square feet or more, the first Inclusionary Unit shall be a unit with at least two (2) bedrooms, and subsequent Inclusionary Units shall be allocated such that:
All Inclusionary Units shall be comparable in exterior design, materials, and finishes to market-rate units.
The interior amenities of Inclusionary Units, such as finishes and appliances, shall be comparable to the market-rate units but may consist of less expensive materials and equipment, provided the interior amenities are durable, of good quality, and consistent with contemporary standards for new housing.
All Inclusionary Units in an Inclusionary Development shall be constructed prior to or concurrently with the construction of market-rate units, except that in a phased development, the Inclusionary Units shall be constructed at a pace that is proportional to the construction of the market-rate units.
Inclusionary Units shall not be overly concentrated by tenure, dwelling type, including single dwelling units, flats, or multiple dwellings, or on any floor of a project.
In an Inclusionary Development subject to Subtitle C § 1001.4, Inclusionary Units may be located solely in the new gross floor area provided all the existing units were occupied at the date of application for the building permit for the new gross floor area and all other requirements of this chapter are met.
Inclusionary Units in apartment houses shall not be located in cellar space.
For Inclusionary Developments, a bedroom shall mean a habitable room with immediate access to an exterior window and a closet that is designated as a "bedroom" or "sleeping room" on construction plans submitted in an application for a building permit.
D.C. Mun. Regs. tit. 11, r. 11-C1005