(ii) for housing accommodations subject to the RSL pursuant to section 421-a of the Real Property Tax Law, for building-wide and individual dwelling unit services: the date of issuance of the initial Certificate of Occupancy;
(iii) for housing accommodations subject to the RSL on June 30, 1971, and exempted thereafter as a result of a vacancy prior to June 30, 1974, for building-wide services: May 31, 1968; for individual dwelling unit services: May 29, 1974;
(iv) for dwelling units which became subject to the RSL on July 1, 1974, pursuant to section 423 of the Real Property Tax Law, for building-wide and individual unit services: May 29, 1974, except that for housing accommodations in the Riverton Apartments at East 138th Street, Manhattan, which became subject to the RSL on July 1, 1974, pursuant to an initial legal regulated rent date of June 30, 1973, for building-wide and individual dwelling unit services: June 30, 1973;
(v) for housing accommodations which are subject to this Code solely as a condition of receiving or continuing to receive benefits pursuant to section 11-243 (formerly J51-2.5) or 11-244 (formerly J51-5.0) of the Administrative Code of the City of New York, as amended, for building-wide and individual unit services: January 1, 1976, or the date of the issuance of a Certificate of Reasonable Cost, whichever is later;
(vi) for housing accommodations for which rents are established by governmental agencies pursuant to the PHFL, or which are first made subject to this Code pursuant to the PHFL, the building-wide and individual unit services which were required for approval in connection with the establishment of initial rents pursuant to the PHFL: the effective date of the initial rents;