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In all districts, as indicated, the following shall provide street trees in accordance with Section 26-41 (Street Tree Planting):

(a)        developments, or enlargements that increase the floor area on a zoning lot by 20 percent or more. However, street trees shall not be required for enlargements of single- or two-family residences, except as provided in paragraphs (b) and (c) of this Section;

(b)        enlargements of single- or two-family residences by 20 percent or more within the following special purpose districts:

Special Bay Ridge District;

Special Bay Street Corridor District;

Special Clinton District;

Special Downtown Brooklyn District;

Special Downtown Far Rockaway District;

Special Downtown Jamaica District;

Special East Harlem Corridors District;

Special Grand Concourse District;

Special Hillsides Preservation District;

Special Hudson Yards District;

Special Little Italy District;

Special Long Island City Mixed Use District;

Special Ocean Parkway District;

Special South Richmond Development District;

(c)        enlargements, pursuant to the Quality Housing Program, of single- or two-family residences by 20 percent or more;

(d)        conversions of 20 percent or more of the floor area of a building to a residential use; or

(e)        construction of a detached garage that is 400 square feet or greater.

The street frontage used to calculate the number of required trees may exclude the street frontage occupied by curb cuts serving uses listed in Use Groups 16B, 16C and 16D.