R6 R7 R8 R9 R10 R11 R12

C1-6 C1-7 C1-8 C1-9 C2-6 C2-7 C2-8 C4-2 C4-3 C4-4 C4-5 C4-6 C4-7 C4-8 C4-9 C4-11 C4-12 C5 C6 C7 C8-2 C8-3 C8-4

M1-2 M1-3 M1-4 M1-5 M1-6 M2 M3

In the districts indicated, and for those not otherwise governed by the provisions of Sections 62-341 (Height and setback regulations in lower density districts) or 62-342 (Height and setback regulations in medium- and high-density districts with a letter suffix), the underlying height and setback regulations are applicable for all developments on portions of a zoning lot landward of the shoreline or on platforms, except as modified by the provisions of this Section. 

1. Modified base height and building heights 
   
   For all buildings, the base heights, transition heights, and building heights for buildings on waterfront blocks shall be as set forth in the following table. Additional regulations are set forth in paragraph (b) for buildings containing residences and in paragraph (c) for all other buildings. For all buildings, tower regulations are set forth in paragraph (d).
    

   MAXIMUM BASE HEIGHT, TRANSITION HEIGHTS,

   AND MAXIMUM BUILDING HEIGHT - FOR NON-CONTEXTUAL DISTRICTS

    

    

   District	Maximum Base Height (in feet)	Transition Zone		Maximum Height of Buildings or other Structures (in feet)
   		Maximum Transition Height Tier 1 (in feet)	Maximum Transition Height Tier 2 (in feet)
   R6-2 C1 or C2 mapped within R6-2	55	75	95	195
   R6 R6-1 C1 or C2 mapped within R6 or R6-1 C7-1 C8-2 C8-3 M1-2 M1-4 M2-1 M2-3 M3	65	95	125	255
   R7-1 R7-2 C1 or C2 mapped within R7-1 or R7-2 C7-2 C7-3	85	115	155	315
   R7-3 C1 or C2 mapped within R7-3 C7-3 C8-4 M1-3 M1-5 M2-2 M2-4	95	145	185	375
   R8 C1 or C2 mapped within R8 C4-8 C6-1 C6-2	105	145	215	435
   R9 C1 or C2 mapped within, or with a residential equivalent of an R9 C4-9 C6-3 C7-5 C7-6	135	185	285	N/A
   R9-1 C1 or C2 mapped within an R9-1	155	215	315	N/A
   R10 C1 or C2 mapped within, or with a residential equivalent of an R10 C4-6 C4-7 C5 C6-4 C6-5 C6-6 C6-7 C6-8 C6-9 C7-7 M1-6	155	235	355	N/A
   R11 C1 or C2 mapped within R11 C4-11 C6-11 C7-8	155	325	405	N/A
   R12 C1 or C2 mapped within R12 C4-12 C6-12 C7-9	155	395	495	N/A

    

2. Additional regulations for buildings containing residences
   
   For buildings containing residences, the following shall apply:
   1. for street walls not facing the shore public walkway or supplemental public access areas:
      1. the street wall location provisions of paragraph (b) of Section 23-431 shall apply, and such street walls shall extend to a minimum base of at least 35 feet, or the height of the building, whichever is less; and
      2. at a height not lower than the minimum base height or higher than the maximum base height, setbacks shall be provided in accordance with the provisions of Section 23-433. 
   2. for portions of buildings facing the shore public walkway or supplemental public access areas:
      1. no street wall location provisions shall apply; 
      2. at a height not higher than the maximum base height, a setback, with a minimum depth of 30 feet shall be provided from the boundary of the shore public walkway. Wherever a supplemental public access area is provided as a widened shore public walkway, such widened area shall be included in the setback distance; 
      3. dormers shall be permitted in such setback, in accordance with Section 23-413, except that the depth of such dormer shall not exceed 15 feet;
      4. where a street wall is located within 50 feet of the shoreline, the maximum base height shall not exceed a height of 85 feet; and
      5. an amount of building frontage equivalent to at least 25 percent of the aggregate width of street walls facing the shore public walkway shall either be provided as open area in an outer court or shall have a reduced base height that does not exceed two-thirds of the height of the permitted maximum base height;
          

         

   3. along all frontages, after the required setback, buildings may rise to the maximum transition zone height set forth in the table, which consists of maximum Tier 1 and Tier 2 transition heights. Where the gross area of any story within the transition zone exceeds 10,000 square feet, exclusive of the square footage contained in any permitted dormers, one or more setbacks shall be provided at a height not higher than the maximum Tier 1 transition height. Such setbacks may be of any depth, but shall reduce the gross area of stories such that the highest gross area of any story in the Tier 2 transition zone is at least 10 percent less than that of the highest gross area of any story in the Tier 1 transition zone; and
       

      

   4. any portion of a building that exceeds the maximum transition height shall be considered a tower and shall be subject to the provisions of paragraph (d) of this Section. 
3. Additional regulations for other buildings
   
   For buildings that do not contain residences, the following shall apply:
   1. Above the maximum base height, a building shall be set back at least:
      1. 15 feet from a narrow street line;
      2. 10 feet from a wide street line; or
      3. 30 feet from the boundary of a shore public walkway. Wherever a supplemental public access area is provided as a widened shore public walkway, such widened area shall be included in the setback distance.
          

           Dormers provided in accordance with paragraph (b) of Section 23-413 shall be permitted within any setback area, provided that the depth of encroachment of a dormer facing the shore public walkway shall not exceed 15 feet; 

   2. after the required setback, buildings may rise to the maximum transition height;
   3. any portion of a building that exceeds the maximum transition height shall be considered a tower and subject to the provisions of paragraph (d) of this Section. 
4. Tower regulations 
   
   Any portion of a building that exceeds the maximum transition height shall be subject to the following tower provisions: 
   1. The maximum width of any story of a tower that faces a shoreline shall not exceed 100 feet. Such width shall be measured by inscribing within a rectangle the outermost walls at the level of each tower story. Any side of such rectangle from which perpendicular lines may be drawn to a shoreline, regardless of any intervening structures, properties or streets, shall not exceed 100 feet. However, such limitation may be modified as follows:
      1. where a tower faces two or more shorelines, such restriction shall apply only to one face, and the maximum length along other frontages shall not exceed 130 feet frontage (See illustration);
      2. where the average depth of a zoning lot is less than 200 feet, the maximum width of a story shall not exceed 130 feet.
          

         

   2. for residential stories within a tower, the following shall apply:
      1. the tower footprint shall not exceed a gross area of 10,000 square feet, except that where the overall height of a tower exceeds two-thirds of the overall maximum permitted height set forth in the table, a portion of tower stories equivalent to at least one-third of the height of the building, excluding any penthouse provided as a permitted obstruction, shall have a footprint that does not exceed 8,500 square feet. Dormers need not be included in the calculation of such maximum gross area; and 
      2. where two or more towers are provided on a zoning lot, there shall be at least 50 feet in difference in height between any two immediately adjacent towers.