The Board of Trustees of the Village of Ballston Spa hereby finds that excessive uniformity, dissimilarity, inappropriateness or poor quality of design in the exterior appearance of buildings erected in the business districts adversely affects the desirability of the area and neighboring areas. It is the purpose of this section to prevent these and other harmful effects of such exterior appearances of buildings erected in the business districts and thus to promote the health, safety, comfort and general welfare of the community, to promote the public convenience and prosperity, to conserve the value of buildings and to encourage the most appropriate use of land.