(e) An owner may file an application to modify or substitute required services, at no change in the legal regulated rent, on forms prescribed by the DHCR on the grounds that:
(1) the owner and tenant, by mutual voluntary written agreement, consent to a modification or substitution of the required services provided in the housing accommodation; or
(2) such modification or substitution is required for the operation of the building in accordance with the specific requirements of law; or
(3) such modification or substitution is not inconsistent with the RSL or this Code.
No such modification or substitution of required services shall take place prior to the approval of the owner's application by the DHCR, except that a service modification or substitution pursuant to paragraph (2) of this subdivision may take place prior to such approval.
(f) Pursuant to section 452(7) of the PHFL, as an alternative to the rental adjustments for which an owner may file an application under subdivision (a) of this section, upon the completion of the rehabilitation of a multiple dwelling which is aided by a loan made pursuant to article VIII- A of the PHFL, HPD may adjust the rent for each housing accommodation within the multiple dwelling pursuant to such law. Any work required pursuant to or as a condition of an article VIII- A loan for which a rent adjustment is granted under section 452(7) of the PHFL is not eligible for an increase pursuant to paragraph (a)(2) or (3) of this section.