Zoning for planned unit development. If the Village Board grants the redistricting to planned unit development, the Zoning Map shall be so amended. When rezoning a parcel, the Village Board shall establish the maximum number of dwelling units therein and may, if it feels it necessary in order to fully protect the public health, safety and welfare of the community, attach to its zoning resolution any additional requirements for the applicant to meet. Such requirements may include, but not be limited to, visual and acoustical screening, land use mixes, order of construction and/or occupancy, vehicular and pedestrian circulation systems, availability of sites within the area for necessary public services such as schools, firehouses and libraries, protection of natural and/or historic sites and other physical or social demands. The Village Board shall further approve the final site plan prior to effectuation of the Zoning Map amendment and the issuance of a building permit by the Building Inspector. Such site plan may constitute the entire development or, if staged, only a portion thereof. If the project is to be constructed in stages, only that portion receiving site plan approval may be effectuated.