(a) No building or structure shall be erected or altered within an historic district until after an application for a certificate of appropriateness as to exterior architectural features has been submitted to the historic district commission and approved by said commission.

(b) No building permit for erection of a building or structure or for alteration of an exterior architectural feature within an historic district and no demolition permit for demolition or removal of a building or structure within an historic district shall be issued by a municipality or any department, agency or official thereof until a certificate of appropriateness has been issued. A certificate of appropriateness shall be required whether or not a building permit is required.

(c) The historic district commission may request such plans, elevations, specifications, material and other information, including in the case of demolition or removal, a statement of the proposed condition and appearance of property after such demolition or removal, as may be reasonably deemed necessary by the commission to enable it to make a determination on the application. The style, material, size and location of outdoor advertising signs and bill posters within an historic district shall also be under the control of such commission. The provisions of this section shall not be construed to extend to the color of paint used on the exterior of any building or structure.

(d) No area within an historic district shall be used for industrial, commercial, business, home industry or occupational parking, whether or not such area is zoned for such use, until after an application for a certificate of appropriateness as to parking has been submitted to the commission and approved by said commission. The provisions of this section shall apply to the enlargement or alteration of any such parking area in existence on October 1, 1973.