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(a) No structure shall be constructed, reconstructed, enlarged, altered, or relocated so as to have or result in a greater height, bulk, or Floor Area Ratio, less Required Open Space as defined in Section 1021
this Code, or less off-street loading space, than permissible under the limitations set forth herein for the district or districts in which such structure is located.;1
provided, however, that, except in the North Beach-Telegraph Hill Residential Special Use District, for the purpose of creating habitable space or an Accessory Dwelling Unit pursuant to Section 207(c)(4) of this Code where the exception is in consideration of the property owner entering into a Regulatory Agreement pursuant to Section 207(c)(4)(H) subjecting the ADU to the San Francisco Rent Stabilization and Arbitration Ordinance, and as long as the number of above-ground building stories is not increased:
(1) the ceiling height of an existing building story in a lawfully-existing nonconforming structure may be increased to create an interior floor-to-ceiling height of up to nine feet; and/or
(2) a flat roof may be replaced with a pitched roof.
The alterations permitted by subsections (a)(1) and (a)(2) above shall be subject to applicable design guidelines, including the Residential Design Guidelines, for the zoning district in which the building is located. If a building is a historic resource or located in a historic district, the alterations shall also comply with applicable Secretary of Interior Standards and other Code provisions pertaining to historic properties. Building heights shall be measured according to the procedures of Section 260.
(b) No existing structure which fails to meet the requirements of this Code in any manner as described in subsection (a) above, or which occupies a lot that is smaller in dimension or area than required by this Code, shall be constructed, reconstructed, enlarged, altered, or relocated so as to increase the discrepancy, or to create a new discrepancy, at any level of the structure, between existing conditions on the lot and the required standards for new construction set forth in this Code.
(c) No required open space, off-street parking space, or loading space existing or hereafter provided about, in, or on any structure shall be reduced below the minimum requirements therefor set forth in this Code, or further reduced if already less than said minimum requirements. No required open space, off-street parking space, or loading space existing or hereafter provided for a structure or use and necessary to meet or meet partially the requirements of this Code for such structure or use shall be considered as all or part of the required open space, off-street parking space, or loading space required for any other structure or use, except as provided in Section 160 for the collective provision or joint use of parking.
(d) Existing Live/Work Units, or those newly created or expanded within the existing exterior walls of a structure, so long as they conform to all Building Code requirements, shall not be considered an enlargement, construction, reconstruction, alteration, or relocation for purposes of this Section 172.
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