(1) To contribute to the effect of prohibiting the commercial and industrial use, other than existing commercial or industrial use not inconsistent with the purposes of the Act of August 7, 1961 (75 Stat. 284, 291), of all property within the boundaries of the Cape Cod National Seashore and situated in the towns of Provincetown, Truro, Wellfleet, Eastham, Orleans and Chatham; and

(2) to promote preservation and development, in accordance with the purposes of the said Act, of the area comprising the seashore, by means of acreage, frontage and setback requirements and other provisions which may be required to be included in zoning bylaws consistent with the laws of Massachusetts. Zoning bylaws or amendments of zoning bylaws applicable to the area within Cape Cod National Seashore, in order that they may be approved, shall conform to the standards herein set forth relating to preservation and development of the seashore in accordance with the purposes of the said Act. The Secretary shall be given notice of any amendments to approved zoning bylaws that affect the Seashore District. Nothing in these standards or in the zoning bylaws adopted pursuant thereto for the area within Cape Cod National Seashore shall preclude the Secretary of the Interior from fulfilling the responsibilities vested in him by the Act of August 7, 1961, or by the Act of August 25, 1916 (39 Stat. 535), as amended and supplemented.