23-713 - Height and setback modifications LAST AMENDED 12/5/2024 For #zoning lots# in R4 or R5 Districts, without a letter or number suffix, utilizing the #predominantly built-up area# provisions of Section 23-71, inclusive, the following height and setback modifications shall apply: (a) in R4 Districts, the height and setback regulations applicable to an R4A District set forth in Section 23-421 (Basic pitched-roof envelopes for certain districts) shall apply; and (b) in R5 Districts, the height and setback regulations applicable to an R5B District set forth in Section 23-422 (Basic flat- roof envelopes for certain districts) shall apply.