Excessive similarity. The Architectural and Historic Review Board may disapprove any application for a building permit referred to it which shall include the construction, reconstruction or alteration of any building or structure, provided that the Board finds that the building or structure for which the permit is applied would, if erected or altered, be so detrimental to the desirability, property values or development of the surrounding area, consisting of any lot fronting on the same street within 200 feet of the proposed site, as to provoke such harmful effects by excessive similarity to any other structure existing or for which a permit has been issued or to any other structure included in the same permit application or for which an application for a permit is pending in respect to one or more of the following features of exterior design and appearance: apparently identical facade, identical size and arrangement of either doors, windows, porticos or other openings or breaks in the facade facing the street, including reverse arrangement, massing and/or other design elements, provided that a finding of excessive similarity shall be based upon a preponderance of evidence as set forth in the minutes.