Each housing provider commencing substantial rehabilitation, demolition, or housing discontinuance, on or after July 17, 1985, shall pay relocation assistance in an amount calculated under § 42-3507.03 to all tenants of the housing accommodation who:
(1) Were living in the rental units contained in the housing accommodation from which they are being displaced at the time the notice required by § 42-3505.01 is given; and
(2) Are displaced from rental units because the housing accommodation in which they are located is to be substantially rehabilitated, demolished, or discontinued.