Special rule where de minimis equity contribution
Property shall not be treated as failing to be residential rental property for purposes of this section merely because the occupant of a residential unit in the project pays (on a voluntary basis) to the lessor a de minimis amount to be held toward the purchase by such occupant of a residential unit in such project if—
(A) all amounts so paid are refunded to the occupant on the cessation of his occupancy of a unit in the project, and
(B) the purchase of the unit is not permitted until after the close of the compliance period with respect to the building in which the unit is located.
Any amount paid to the lessor as described in the preceding sentence shall be included in gross rent under paragraph (2) for purposes of determining whether the unit is rent-restricted.