Within the Special Stapleton Waterfront District, the street wall location regulations shall be modified as follows:

(a)        Subareas A and B1

In Subareas A and B1, the underlying street wall location regulations shall apply, except that the provisions of paragraph (a)(1) of Section 35-651 (Street wall location) shall be modified to require that at least 70 percent of the aggregate width of street wall be located within 15 feet of the street line and extend to the minimum base heights specified in Section 116-233 (Height and setback), or the height of the building, whichever is less.

(b)        Subareas B2 through B5 and C

In Subareas B2 through B5 and C, the underlying street wall location regulations of a C4-2A District or an R6B District, as applicable, shall be modified as set forth in this Section. Map 3 (Mandatory Front Building Wall Lines) in Appendix A of this Chapter, specifies locations in Subareas B2 through B5 and C where mandatory front building wall requirements apply as follows:

(1)        Type 1: Front building walls shall be coincident with and extend along the entire length of the mandatory front building wall line, except, to allow articulation at the intersection of two such lines, the front building wall may be located anywhere within 15 feet of their point of intersection.

(2)        Type 2: Front building walls shall be located within eight feet of and extend along at least 70 percent of the length of the mandatory front building wall line. For phased development, this requirement may be satisfied by more than one building, provided that upon completion 70 percent of the length of the mandatory front building wall line is occupied by such front building walls.

(3)        Wherever Map 3 does not indicate a mandatory front building wall line, the underlying street wall location rules shall apply.

If more than one building is developed in Subareas B2, B3 or B4, the first building shall be located along a Type 1 mandatory front building wall line. Subsequent buildings shall locate along a Type 2 mandatory front building wall line until 70 percent of the length of the mandatory front building wall line is occupied.

All mandatory front building walls shall rise without setback to the minimum base height specified in Section 116-233, or the height of the building, whichever is less. Recesses shall be permitted on the ground floor where required to provide access to the building. Above the ground floor, up to 30 percent of the aggregate width of the front building wall may be recessed.