Common open space. Not less than 25% of the land area within such a PCD planned unit development shall be devoted to common open space. Any golf course, land dedicated for public use and maintenance for recreational or conservational purposes and land subject to easements prohibiting construction thereon shall be deemed land devoted to common open space for the purpose of satisfying this requirement and shall be deemed residential land for the purpose of § 101-124B. The location of common open space shall be consistent with the declared function of the common open space, and the requirements set forth in Chapter 85, Subdivision and Site Plan Review, with respect to the maintenance of common open space and provision of an organization to own and maintain the open space, shall be applicable to such a PCD planned unit development.