D.C. Mun. Regs. tit. 11, § 2605
2605.1 A development that provides, pursuant to federal or other District housing programs, affordable dwelling units for sale or lease may count such units towards the requirements of this Chapter, provided that all provisions of this Chapter and the Act are met.
2605.2 The proportion of studio, efficiency, and one-bedroom inclusionary units to all inclusionary units shall not exceed the proportion of market-rate studio, efficiency, and one-bedroom units to all market-rate units.
2605.3 All inclusionary units shall be comparable in exterior design, materials, and finishes to the market-rate units.
2605.4 The interior amenities of inclusionary units (such as finishes and appliances) shall be comparable to the market-rate units, but may be comprised of less expensive materials and equipment.
2605.5 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 with the construction of the market-rate units.
2605.6 Inclusionary units shall not be overly concentrated on any floor of a project.
SOURCE: Final Rulemaking published at 53 DCR 7013 (August 25, 2006)