In Residence Districts without a letter suffix, and in M1 Districts paired with Residence Districts without a letter suffix, after the required setback provided in accordance with paragraph (b) of Section 117-342 (Base heights, minimum setbacks and articulation), a building may rise to a maximum transition height of 350 feet, provided that:

(a)    within 100 feet of the easterly street line of 5th Street, north of Anable Basin, the footprint of a building, or portion thereof, within the transition heights shall be limited to that of a tower provided above such transition height in accordance with Section 117-344 (Towers);

(b)    along any single street frontage, the aggregate width of street walls above the required setback and below the maximum transition height shall not exceed 300 feet, and the maximum street wall width of any individual, contiguous street wall, shall not exceed 200 feet; and

(c)    south of Anable Basin, portions of buildings utilizing transition heights shall only be permitted in the following locations:

(1)    within 150 feet of 5th Street; and

(2)    east of an upland connection or visual corridor, where applicable.