For all buildings, where the street wall location regulations of this Resolution require the street wall to be located within eight feet of the street line, such regulations may be modified to accommodate exterior stairs and ramps for access to the building, to comply with the requirements of Section 64-50 (Streetscape Regulations), or to provide temporary flood control devices and associated fixtures, as follows:

(a)        no street wall need be located closer to the street line than eight feet;

(b)        for buildings on zoning lots with a lot width greater than or equal to 50 feet, up to 50 percent of the aggregate width of street walls may be recessed beyond eight feet of the street line, provided that any such recesses deeper than 10 feet along a wide street or 15 feet along a narrow street are located within an outer court and the height of such recess shall not be less than the height of the first story located completely above the level of the adjoining grade; and

(c)        for buildings on zoning lots with a lot width of less than 50 feet:

(1)        for the first story above the flood-resistant construction elevation, or reference plane, as applicable, and any street wall below such first story, the aggregate width of street wall may be located anywhere; and

(2)        for the remaining aggregate width of street walls above such stories, up to 50 percent of the aggregate width of street walls may be recessed beyond eight feet of the street line, provided that any such recesses deeper than 10 feet along a wide street or 15 feet along a narrow street are located within an outer court.

For all buildings where the aggregate width of exterior stairs, ramps, or elevated platforms in front of a street wall exceeds 70 percent or more along the ground floor of the street wall, such stairs, ramps, or elevated platforms shall be screened by living plant material or by the provisions of paragraph (b)(1) of Section 64-521 (Options available for all buildings).