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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 Long Island City Mixed Use District;

Special Ocean Parkway District;

Special SoHo-NoHo Mixed Use 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.