Restricted units may be of different unit housing product types than market-rate units, provided that there is a restricted option available for each market rate housing type. Developments containing market-rate duplexes, townhomes, and/or single-family homes shall offer restricted housing options that also include duplexes, townhomes, and/or single-family homes. Penthouses and higher priced end townhouses shall be exempt from this requirement. The proper ratio for restricted to market-rate unit type shall be subject to municipal ordinance or, if not specified, shall be determined at the time of site plan approval.