In considering the project, the Planning and Zoning Commission shall in no case authorize a use prohibited in the district in which the housing project is to be located, except that buildings for administration and maintenance of the project may be included; nor a building height in excess of that permitted. The minimum distance between a building and a street line shall comply with the front yard requirement of the district. No point of any building shall be nearer than twenty (20) feet to an adjacent building, except that ten (10) feet minimum clearance will be permitted where there is a corner to corner relationship nor more than twenty-five (25) feet from any boundary line of the project. The Board may require such additional restrictions and safeguards as they deem necessary to fulfill the purpose and intent of the Zoning Ordinance.