When new lots are formed from a parcel of land, they shall be created in conformity with the requirements of this Part 1. No permit shall be issued for the erection of a building on a new lot unless the lot complies with all the provisions of this Part 1 and with the rules and regulations of the Planning Board for the subdivision and platting of land.

A map showing environmentally and historically significant areas, prepared by the Village Engineer, incorporating data supplied by the Suffolk County Planning Department and researchers into local history, is on file with the Village Clerk. It shows steep slopes, swales, dense forests, places where seasonal high water tables are less than three feet, tidal and freshwater wetlands, ponds, marshes, prime wildlife areas, historic buildings, accessory buildings, gates, cemeteries and other areas of environmental and historic significance.

When the Planning Board finds that a proposed subdivision contains all or part of an environmentally or historically significant area which may be harmed by the strict application of § 165-25 of this Part 1, then for as many lots as may be necessary to protect the environmentally or historically significant area, with due regard to the policy and purposes of this Part 1 in § 165-3, the Planning Board may suspend § 165-25 with respect to the area of individual lots and minimum front lines, and for main building sites it may suspend § 165-25 with respect to minimum front yard depth, minimum side yard depth, minimum total of both side yards and minimum rear yard depth.

For each lot that includes all or part of an environmentally or historically significant area, an applicant may propose a building envelope plan without regard to the requirements of § 165-25 that may be suspended under § 165-15. A "building envelope" means an outline of the part of a lot in which a main building may be constructed. The subdivision map shall show all approved building envelopes, identify the lots changed under § 165-15 and note any special conditions attached to the changes. No building envelope shall be approved that allows a main building to be constructed within 80 feet of another main building.

Every lot approved under § 165-15 shall be at least one acre in area, and the average area of all the lots in its subdivision shall be no less than under § 165-25. For each substantially oversized lot that is created to hold a subdivision's average area to the standard of § 165-25, the subdivider shall record a covenant and restriction that will run with the land to assure that the lot will not be further subdivided.

Whenever the Planning Board proposes to act under § 165-15, it shall consult with the Board of Architectural Review before giving a preliminary approval and it shall refer the proposed subdivision plan to the Village Board of Trustees for review before giving a final approval.

A main building on a lot approved under § 165-15 shall be built within the approved building envelope, according to all special conditions attached to the approval. Accessory structures may be built within the approved building envelope without additional Planning Board approval. For construction outside the approved building envelope, permission of the Board of Appeals shall be required, under § 165-59.