It is the express intent of the Board of Supervisors that the PO Professional Office Overlay District, the areal boundaries thereof being described by ordinance and delineated on the Township Zoning Map, is deemed an overlay on any other zoning district that may lie within the bounds of the PO Professional Office Overlay District. Any lot, land, or tract of ground may be used for any purpose allowed in such other district subject to the standards and regulations governing such other district.