The underlying height and setback regulations shall be further modified for the following areas within Subdistrict D:

(a)        for portions of zoning lots located in Subarea D2, the maximum permitted base height shall be 75 feet;

(b)        for portions of zoning lots located in Subarea D3, the maximum permitted base height shall be 65 feet; and

(c)        for portions of zoning lots located in Subarea D4, the maximum permitted base height shall be 85 feet, and for portions of a development or enlargement containing residences, the maximum permitted base height shall be 65 feet.