A. 
The Town of Medfield, Massachusetts, is divided into eight zoning districts designated as follows:
Full Name
Abbreviation
Agricultural
A
Residential Estate
RE
Residential Town
RT
Residential Suburban
RS
Residential Urban
RU
Business
B
Business-Industrial
BI
Industrial-Extensive
IE
B. 
There are three overlay districts as follows:
Full Name
Abbreviation
Watershed Protection
WP
Floodplain
FP
Aquifer Protection
AQ
The location and boundaries of the zoning districts are established and shown on a map titled "Zoning Map, Medfield, Massachusetts" dated January 30, 2003, which is a part of this Bylaw and which herein is called the "Zoning Map." The authenticity of the Zoning Map shall be identified by the signature of the Town Clerk and the imprinted seal of the Town under the words: "This is to certify that this is the Zoning Map of the Town of Medfield, Massachusetts, referred to in the Zoning Bylaw of the Town of Medfield, Massachusetts, which was adopted by the Town Meeting commencing June 2, 2003." Any change in the location of boundaries of a zoning district by amendment of this Bylaw shall be authenticated in the same manner. The Zoning Map shall be kept on file in the office of the Planning Board. Photographic reductions of this Zoning Map may serve as copies of the Zoning Map.
Where uncertainty exists with respect to the boundary of districts shown on the Zoning Map, these rules apply:
A. 
Where a boundary is indicated as a street, railroad, watercourse or other body of water, it shall be construed to be the center line or middle thereof. Where such a boundary approximates a Town boundary, then it runs to the limits of the Town boundary.
B. 
Where a boundary is indicated as running approximately parallel to a street, railroad, watercourse or other body of water, it shall be construed to be parallel thereto at the distance shown on the Zoning Map.
C. 
Where a boundary is indicated as a specific elevation, it shall be construed as the distance above mean sea level based on the North American Vertical Datum (NAVD) of 1988.
D. 
When a district boundary line divides a lot that is in one ownership of record at the time such line is adopted, a use that is permitted on one portion of the lot may be extended 30 feet into the other portion, provided the first portion includes the required lot width and depth. This allowance does not apply to Floodplain or Watershed Protection Districts described in Articles 10 and 11.