(5) in order for there to be a finding of substantial rehabilitation, all building systems must comply with all applicable building codes and requirements, and the owner must submit copies of the building's certificate of occupancy, if such certificate is required by law, before and after the rehabilitation;
(6) where occupied rent regulated housing accommodations have not been rehabilitated, such housing accommodations shall remain rent regulated until vacated, notwithstanding a finding that the remainder of the building has been substantially rehabilitated, and therefore qualifies for exemption from regulation;
(7) where, because of the existence of hazardous conditions in his or her housing accommodation, a tenant has been ordered by a governmental agency to vacate such housing accommodation, and the tenant has received a court order or an order of the DHCR that provides for payment by the tenant of a nominal rental amount while the vacate order is in effect, and permits the tenant to resume occupancy without interruption of the rent stabilized status of the housing accommodation upon restoration of the housing accommodation to a habitable condition, such housing accommodation will be excepted from any finding of substantial rehabilitation otherwise applicable to the building. However, the exemption from rent regulation based upon substantial rehabilitation will apply to a housing accommodation that is subject to a right of reoccupancy, if the returning tenant subsequently vacates, or if the tenant who is entitled to return pursuant to court or DHCR order chooses not to do so;