In all districts except R1, R2, R3, R4 or R5 Districts or C1 or C2 Districts mapped within such districts, for developments or enlargements, the City Planning Commission may permit development rights to be transferred to adjacent lots from lots occupied by landmark buildings or other structures, may permit the maximum permitted floor area on such adjacent lot to be increased on the basis of such transfer of development rights, may permit, in the case of developments or enlargements containing residences, the minimum required open space or the density requirements to be reduced on the basis of such transfer of development rights, may permit variations in the front height and setback regulations and the regulations governing the size of required loading berths, and minor variations in public plaza, arcade and yard regulations, for the purpose of providing a harmonious architectural relationship between the development or enlargement and the landmark building or other structure.

Where a zoning lot occupied by a landmark building or other structure is located in a Residence District, the Commission may modify the applicable regulation of primary business entrances, show windows, signs and entrances and exits to accessory off-street loading berths on the "adjacent lot" in a Commercial District provided that such modifications will not adversely affect the harmonious relationship between the building on the "adjacent lot" and landmark building or other structure.

For the purposes of this Section, the term "adjacent lot" shall mean a lot that is contiguous to the lot occupied by the landmark building or other structure or one that is across a street and opposite the lot occupied by the landmark building or other structure, or, in the case of a corner lot, one that fronts on the same street intersection as the lot occupied by the landmark building or other structure. It shall also mean, in the case of lots located in C5-3, C5-5, C6-6, C6-7 or C6-9 Districts, a lot contiguous or one that is across a street and opposite to another lot or lots that except for the intervention of streets or street intersections, form a series extending to the lot occupied by the landmark building or other structure. All such lots shall be in the same ownership (fee ownership or ownership as defined under zoning lot in Section 12-10).

A "landmark building or other structure" shall include any structure designated as a landmark by the Landmarks Preservation Commission and the Board of Estimate pursuant to Chapter 8-A of the New York City Charter and Chapter 8-A of the New York City Administrative Code, but shall not include those portions of zoning lots used for cemetery purposes, statues, monuments and bridges. No transfer of development rights is permitted pursuant to this Section from those portions of zoning lots used for cemetery purposes, any structures within historic districts, statues, monuments or bridges.

The grant of any special permit authorizing the transfer and use of such development rights shall be in accordance with all the regulations set forth in Sections 74-791 (Requirements for application), 74-792 (Conditions and limitations) and 74-793 (Transfer instruments and notice of restrictions).