Elevations and floor plans of the residences shall be as per the attached Exhibits B-1, B-2, B-3 and B-4, Building Elevations Proposed Planned Development District Townhouse Development 261 Winter Street Extension, dated June 2008, prepared by ABD Engineers and Surveyors. These exhibits represent a generalized style of the buildings, and the Building Department designee shall review any changes to this design. Any substantial changes shall be referred to the Planning Board for final approval.