Permitted Variations. The :PD overlay district provides for variations to the underlying principal district regulations and standards, excluding density and floor area ratio ranges (which are established by the General Plan). Development regulation variations may include, but are not limited to: setbacks, yards, height limitations, street standards, parking and loading, landscaping, open space, and lot area. The :PD development may also shift uses in the underlying principal zoning district between conditional and permitted use categories.