With respect to conversions of housing accommodations by owners or contract purchasers who received a notice of filing or filed articles of incorporation as a housing cooperative prior to August 10, 1980 (the effective date of the Rental Housing Conversion and Sale Emergency Act of 1980 (D.C. Act 3-248)), or prior to the effective date of this chapter [September 10, 1980], the following provisions shall apply:
one-person household 50% two-person household 60% three-person household or a 1- or 2-person household containing any person who is 60 years of age or older or who has a disability as defined by the Mayor 90% four-person household 100% five-person household 110% more than 5-person household 120%
Such housing assistance shall be paid in 1 lump sum payment within 30 days after the date such recipient relocates. Beginning with the 25th month occurring immediately after the month in which such recipient relocated, and for the immediately succeeding 35 months thereafter, housing assistance payments to such recipient shall be made by the Mayor if, as of the first day of the 25th month occurring after his or her relocation, the recipient is eligible for such payment. In lieu of monthly payments, the Mayor may make a lump sum payment to an eligible recipient equal to the amount to which he or she is entitled to receive under this section.
D.C. Code § 42-3402.11