A rental unit may be exempt from the Rent Stabilization Program under § 205(a) (5) of the Act (D.C. Official Code § 42-3502.05(a)(5)) (the cooperative exemption) if:
A unit in a co-op building exclusively offered for lease or occupancy to shareholders or members in a cooperative housing association ("exclusive unit") does not need to be registered by the association as a rental unit under this chapter.
A rental unit in a co-op building shall not be exempt under this section if it is a non-exclusive unit, in which case the rental unit shall be registered by the association in accordance with this chapter, on a Registration/Claim of Exemption Form listing all non-exclusive units in the co-op building as part of one (1) housing accommodation.
A shareholder's or member's stock ownership or membership in a cooperative housing association shall not constitute an interest in any other rental unit in the co-op building as to which the owner or member does not have a proprietary lease or occupancy agreement; provided, that if a co-op building includes any nonexclusive units, each shareholder or member shall be deemed to have an interest in each non-exclusive unit for the purposes of § 4107.
D.C. Mun. Regs. tit. 14, r. 14-4108