The basic maximum floor area ratio of a zoning lot containing non-residential buildings shall be 10.0 and may be increased to a maximum floor area ratio of 12.0 pursuant to Section 93-31 (District Improvement Fund Bonus). Such zoning lot may also contain residences within buildings existing on January 19, 2005, provided that such buildings are not enlarged after such date. For zoning lots containing residences within a building that is developed or enlarged on or after January 19, 2005, the basic maximum floor area ratio shall be 6.5. The floor area ratio of any such zoning lot may be increased from 6.5, pursuant to Section 93-31, and pursuant to Section 23-90 (INCLUSIONARY HOUSING), as modified by Section 93-23 (Modifications of Inclusionary Housing Program), provided that for every five square feet of floor area increase pursuant to Section 93-31, there is a floor area increase of six square feet pursuant to Section 23-90, as modified by Section 93-23, inclusive. The maximum residential floor area ratio shall be 12.0.

For the conversion to dwelling units of non-residential buildings, or portions thereof, where the total floor area on the zoning lot to be converted to residential use exceeds a floor area ratio of 12.0, such excess floor area shall be permitted only pursuant to Section 93-31.

For developments or enlargements on qualifying transit improvement sites, a floor area bonus for mass transit station improvements may be granted by the City Planning Commission pursuant to the provisions of Section 66-51 (Additional Floor Area for Mass Transit Station Improvements). As a pre-condition to applying for such floor area bonus, the applicant shall demonstrate that a floor area ratio of no less than 0.1 of the maximum floor area ratio pursuant to Section 93-31 or Section 93-23, has been achieved prior to, or in conjunction with, the application. For the purposes of this paragraph, defined terms additionally include those in Section 66-11 (Definitions).