(iv) For any tenant receiving rental assistance under the HOPWA rental subsidy program who commenced occupancy of a rental unit after May 17, 2016, the initial base rent for each unit occupied by such tenant shall be the HAP Contract Rent in effect as of the date the tenant commences occupancy of such unit.
(v) For any tenant whose tenant-based rental assistance terminates or expires, for whatever reason, after August 30, 1998, the base rent for each such unit following expiration or termination shall be the HAP contract rent in effect for that unit immediately prior to the expiration or termination of the tenant-based rental assistance.
(B) For any tenant occupying a unit upon the expiration or termination, for whatever reason, of a project-based HAP contract under Section 8 of the United States Housing Act of 1937 (42 USC Section 1437f, as amended), the base rent for each such unit following expiration or termination shall be the "contract rent" in effect for that unit immediately prior to the expiration or termination of the project-based HAP contract.
(C) For any tenant occupying a unit upon the prepayment or expiration of any mortgage insured by the United States Department of Housing and Urban Development ("HUD"), including but not limited to mortgages provided under Sections 221(d)(3), 221(d)(4) and 236 of the National Housing Act (12 USC Section 1715z-1), the base rent for each such unit shall be the "basic rental charge" (described in 12 USC 1715z-1(f), or successor legislation) in effect for that unit immediately prior to the prepayment of the mortgage, which charge excludes the "interest reduction payment" attributable to that unit prior to the mortgage prepayment or expiration.
(b) Board. The Residential Rent Stabilization and Arbitration Board.