The Common Council hereby finds that excessive uniformity, dissimilarity, inappropriateness, or poor quality of design in the exterior appearance of buildings erected in any neighborhood adversely affects the desirability of the immediate area and neighboring areas for residential, business, or other purposes and by so doing impairs the stability and value of both improved and unimproved real property in such areas, prevents the most appropriate development and use of such areas, contributes to the degeneration of property in such areas with attendant deterioration of conditions affecting the health, safety, and general welfare of the community, and contributes to the diminution of the taxable value of real property in such areas and its ability to support the municipal services provided therefor. It is the purpose of this article to prevent these and other harmful effects of such exterior appearance of buildings erected or altered in any neighborhood and thus to promote the health, safety, and general welfare of the community, conserve the value of buildings, and encourage the most appropriate use of land within the City of Port Jervis.