For the purposes of this Bylaw, the Town is hereby divided into the types of zoning districts set forth below:

Overlay districts shall be superimposed on other districts established by this Bylaw. Any land in an overlay district shall also be subject to and have the benefit of the development and use regulations for the applicable underlying district(s) and shall, in addition, conform to the additional regulations of the one or more overlay districts in which the land lies. In the event of any conflict between the regulations of two or more overlay districts that apply to the same lot of land, or in the event of conflict between an underlying district(s) and an overlay district affecting it, the conflict shall be resolved in favor of the most restrictive regulations. The following overlay districts are hereby established and described in Section 8.0:

The boundaries of districts set forth in Section 2.1 and Section 2.2 are located and described by detailed written descriptions or by delineation on Zoning Maps on file with the Planning Board. The descriptions and delineations shall be deemed a part of the Bylaw. Where detailed written descriptions of a district boundary conflict with the Zoning Map, the detailed written description shall prevail.

Any changes in the boundaries or location of zoning districts shall be made by the same procedure as an amendment to the text of the Zoning Bylaw. See Section 1.5.

The following rules shall apply for the interpretation of district boundaries:

When a lot is situated in part of the Town of Andover and in part in an adjacent city or town, the regulations and restrictions of this Bylaw shall be applied to that portion of the lot that lies in the Town of Andover in the same manner as if the entire lot were situated therein.

Where a boundary line between zoning districts divides a lot, the dimensional and use regulations of the less regulated district shall apply to that part of the lot located in the more regulated district that lies within 30 feet of the district boundary. The portion of the lot that falls beyond 30 feet shall comply with the dimensional and use regulations of the more regulated district. For this purpose, for example, a single residence district is deemed more regulated than a business district and an industrial district; and a business district more regulated than an industrial district. For sub-districts within a principal district, the Building Commissioner shall determine which sub-district is the less regulated one.