In that portion of the SED Zone located in the Pinelands Area, Pinelands Development Credits shall be used for 25% of all units approved as part of any residential development, including a Planned Retirement/Senior Citizen/Active Adult Development in accordance with subsection 26-28.2.b. One-quarter of a Pinelands Development Credit (i.e., one right) shall be purchased and redeemed for every four approved residential units.