23-42 - Height and Setback Requirements in R1 Through R5 Districts LAST AMENDED 12/5/2024 R1 R2 R3 R4 R5 In the districts indicated, the height and setback regulations of a #building or other structure# shall be as set forth in Section 23- 421 (Basic pitched-roof envelopes for certain districts) and 23-422 (Basic flat-roof envelopes for certain districts). Where applicable, standard setback provisions are set forth in Section 23-423. Such heights may be increased on #qualifying residential sites# or on #zoning lots# containing #qualifying senior housing#, or for certain #large sites#, pursuant to Sections 23-424 or 23-425, respectively. Additional provisions are set forth in Section 23-426 and Section 23-44, inclusive. The height of all #buildings or other structures# shall be measured from the #base plane#. For the purposes of this Section, where #base planes# of different elevations apply to different portions of a #building or other structure#, each such portion of the #building# may be considered to be a separate #building#. Furthermore, for the purposes of this Section, #building segments# may be considered to be separate #buildings# and #abutting# #semi-detached# #buildings# may be considered to be one #building#.