In the Upland Subdistrict, underlying height and setback regulations shall apply, except as modified pursuant to the provisions of this Section, inclusive.

In the South and North Waterfront Subdistricts, the underlying height and setback regulations of Section 62-34 (Height and Setback Regulations on Waterfront Blocks) shall apply, except that:

1. in the South Waterfront Subdistrict, permitted obstructions shall be allowed pursuant to Section 128-31 (Permitted Obstructions); and
2. in the North Waterfront Subdistrict, developments, enlargements, alterations and changes of use permitted pursuant to Section 128-61 (Special Permit for North Waterfront Sites) shall instead be subject to the Proposed Plans, as set forth in Section 128-61, as approved pursuant to such special permit.

All heights shall be measured from the base plane, except that wherever a minimum or maximum base height is specified for zoning lots with multiple street frontages, such heights shall be determined separately for each street frontage, with each height measured from the final grade of the sidewalk fronting such street wall.