The boundaries of the Residential District and the Business District are as shown on a map entitled "Zoning Map of the Town of Wenham, Massachusetts," dated June 25, 1973, as amended from time to time prepared by Essex Survey Service, Salem, Massachusetts, signed by the Planning Board and on file with the Town Clerk. Said map is hereby made part of this bylaw.
Boundaries shall be interpreted as described in the following subsections.
A.
Center line. The boundaries between Residential, Senior Housing District, Floodplain, Aquifer Protection District, and Business Districts are, unless otherwise indicated on the Zoning Map, the center lines of streets.
B.
Lots in two districts. Where a district boundary line divides a lot in single ownership at the same time this bylaw is adopted, the regulations for the less-restricted portion of such lot shall not extend more than 30 feet into the more restricted portion, provided the lot has frontage in the less-restricted district.