District of Columbia Code Division VII. Property. § 42-3404.10. Accommodations with 2 through 4 units.

(1) Joint and several response. -- The tenants may respond to an owner's offer first jointly, then severally. Upon receipt of a written offer of sale from the owner that includes a description of the tenant's rights and obligations under this section, or upon the Mayor's receipt of a copy of the written offer of sale, whichever is later, a group of tenants acting jointly shall have 15 days to provide the owner and the Mayor, by hand or by sending by certified mail, with a written statement of interest. Following that time period, if the tenants acting jointly have failed to submit a written statement of interest, an individual tenant shall have 7 days to provide a statement of interest to the owner and the Mayor, by hand or by sending by certified mail,. Each statement of interest must be clear expression of interest on the part of the tenant or tenant group to exercise the right to purchase as specified in this subchapter;

(3) Time before settlement. -- The owner shall afford the tenant a reasonable period prior to settlement in order to secure financing and financial assistance, and shall not require less than 90 days after the date of contracting. If a lending institution or agency estimates in writing that a decision with respect to financing or financial assistance will be made within 120 days after the date of contracting, the owner shall afford an extension of time consistent with that written estimate;

(4) Lapse of time. -- If 240 days elapse from the date of a valid offer under this subchapter and the owner has not sold or contracted for the sale of the accommodation, the owner shall comply anew with the terms of this subchapter.