Notwithstanding any other provision of law, the following setback requirements shall apply: (

a) Buildings in the first half block north of L Street between a line parallel to and feet to the east of 15th Street on the east and a line parallel to and feet to the west of 9th Street on the west, and buildings in the first half block west of 9th Street between L Street on the north and N Street on the south shall be subject to the following setback requirements:

(1) Each building shall be set back not less than feet from the property line along L Street or 9th Street.

(2) Buildings may be designed to include street level pedestrian oriented features such as arcades, plazas, or building bases. These features may extend up to six feet into the required 15-foot setback area, but shall not exceed feet in height. (

b) Buildings in the first half block east of 15th Street between L Street on the north and N Street on the south shall be subject to the following setback requirements:

(1) Each building shall be set back not less than feet from the property line along 15th Street.

(2) That portion of each building exceeding feet shall be set back not less than feet from the base of the building along 15th Street. (

c) Buildings in the first half block east of 11th Street between I Street on the north and a line parallel to and feet to the south of K Street on the south, and buildings in the first half block to the west of 11th Street between H Street on the north and a line parallel to and feet to the south of K Street on the south, shall be subject to the following setback requirement: That portion of each building exceeding feet or five floors, whichever is lower, shall be set back not less than feet from the base of the building along Capitol Mall and 11th Street.