A use designated as a Conditional Use shall be allowed in a Zoning District when such Conditional Use, its location, extent and method of development will not substantially alter the character of the vicinity or unduly interfere with the use of adjacent lots in the manner prescribed for the Zoning District. To this end the Planning and Zoning Commission shall, in addition to the Development Standards for the Zoning District, set forth such additional requirements as will, in its judgment render the Conditional Use compatible with the existing and future use of adjacent lots and the vicinity.