Planned Development Districts may be permitted as amendments to the Zoning Map, after application and approval of specific and detailed plans, where tracts suitable in location and character for the uses and structures proposed are to be planned and developed as units. Regulations set forth herein are adapted to unified planning and development in such districts. Applications for Planned Developments will be granted only when the Development Plan for the project is such that the public health, safety and welfare will not be jeopardized by a departure from the restrictions on corresponding uses in the standard zoning district.