Plat requirements. In addition to the standard plat requirements for conventional subdivisions, the plat showing such cluster development may include areas within which structures may be located, the heights and spacing of buildings, open spaces and their landscaping, off-street open and enclosed parking spaces, streets, driveways and other features required by the Planning Board. In the case of a residential plat or plats, the dwelling units permitted may be, at the discretion of the Planning Board, in detached, semidetached, attached or multistory structures.