Planned Retirement/Senior Citizen/Active Adult Development, at a maximum density of eight units per acre, consisting of one or more of the following housing types:
1. Townhouses (Single-family unit where each unit shares a common wall with one or two units) or Quadraplexes (four unit building where each unit shares a common wall with two other units), pursuant to the requirements of Section
26-23.
2. Multifamily apartment building for Senior Citizen occupancy, limited to 50 units in any one building and 3.5 stories and 50 feet in height.