All residential development shall meet the requirements of the PRD-1 district as set forth in subsections 54-30E(1), (2), (3), (4), (7), (8), (9), (10), (11), and (12) as well as:
(a) Minimum lot area for individual lots. Every individual lot developed with a single-family detached dwelling shall have a minimum lot size of 5,000 square feet. Every individual lot developed with a two-family dwelling shall have a minimum lot area of 6,000 square feet.
(b) Minimum lot width for individual lots. Every individual lot developed with a single-family detached dwelling shall have a minimum lot width of 50 feet. Every individual lot developed with a two-family dwelling shall have a minimum lot width of 60 feet. Every individual lot developed with a single-family attached dwelling shall have a minimum lot width of 16 feet.
(c) Maximum gross density. The maximum gross density for residential development shall be eight dwelling units per acre; provided, however, a density bonus shall be permitted, as herein regulated, which is related to a reduction in energy consumption or demand. The reduction shall be based on comparison of the proposed development over the minimum requirements of the F.H.A. energy standards. The relationship of energy conservation to permitted density is as follows:
[1] Gross density with less than 10% energy savings: eight dwelling units per acre.
[2] Gross density with at least 10% but less than 20% energy savings: 8.8 dwelling units per acre.
[3] Gross density with at least 20% but less than 30% energy savings: 9.6 dwelling units per acre.
[4] Gross density with at least 30% energy savings: 10.4 dwelling units per acre.