In addition to the plat certificates required when reviewing standard subdivision plats and prior to recording a final plat, the developer shall file, as specified at the time of granting the special exception, a legally constituted maintenance association agreement for improving, perpetually operating, and maintaining the common facilities, including streets, drives, parking areas, and open space and recreation facilities; or he shall file such documents as are necessary to show how the said common areas are to be improved, operated, or maintained. Such documents shall be subject to the approval of the Village Attorney.