(d) buildings containing fewer than six housing accommodations on the date the building first became subject to the RSL, unless such buildings are otherwise subject to this Code pursuant to the RSL or other statutes and regulations; for the purposes of this subdivision, a building shall be deemed to contain six or more housing accommodations if it was part of a multiple family garden-type maisonette dwelling complex containing six or more housing accommodations having common facilities such as a sewer line, water main or heating plant and was operated as a unit under common ownership on the date the building or complex first became subject to the RSL, notwithstanding that Certificates of Occupancy were issued for portions thereof as one- or two-family dwellings;
(e) housing accommodations in buildings completed or buildings substantially rehabilitated as family units on or after January 1, 1974, except such buildings which are made subject to this Code by provision of the RSL or any other statute that meet the following criteria, which, at the DHCR's discretion, may be effectuated by operational bulletin:
(1) a specified percentage, not to exceed 75 percent, of listed building-wide and individual housing accommodation systems, must have been replaced;