All portions of buildings or other structures that exceed the maximum base height specified in the table in this Section shall comply with the following provisions:

(a)        At a height not lower than the minimum base height or higher than the maximum base height specified in the table for the applicable area, a setback with a depth of at least 10 feet shall be provided from any street wall fronting on a wide street and a setback with a depth of at least 15 feet shall be provided from any street wall fronting on a narrow street, except such dimensions may include the depth of any permitted recesses in the street wall.

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^*        for buildings or other structures on Davis Street located 75 feet or more from Jackson Avenue, the minimum base height shall be 40 feet  

(b)        In Area A-1, no setbacks are required above the applicable minimum base height specified in the table in paragraph (a) of this Section. However, if a setback is provided, it shall comply with the provisions of paragraph (a).

(c)        For any zoning lot located in a Historic District designated by the Landmarks Preservation Commission, the minimum base height of a street wall may vary between the height of the street wall of an adjacent building before setback, if such height is lower than the minimum base height required, up to the minimum base height requirements of this Section.