3.11

For the purpose of this Ordinance, the City of Cambridge is hereby divided into fifty classes of districts listed below in order of decreasing restrictiveness as follows:

3.12

In addition to the districts established under Subsection 3.11, overlay districts may be established from time to time. As specified elsewhere in this Ordinance, each overlay district shall have special regulations which shall be applicable in lieu of or in addition to the regularly applicable regulations for the base zoning district.

(Ord. No. 2021-3, § i, 6-7-2021; Ord. No. 2022-21, § 1, 4-3-2023; Ord. No. 2025-1, 2-10-2025)

3.21

The boundaries of each of the said districts are hereby established as shown on the map entitled, Zoning Map of the City of Cambridge, or as hereafter amended, which map is attached to and made a part of this Ordinance. The said Zoning Map and all boundaries, notations, and other data shown thereon are made by this reference as much a part of this Ordinance as if fully described and detailed herein. The said map shall be filed in the custody of the City Clerk of Cambridge and may be examined by the public subject to any reasonable regulations established by the City Clerk.

3.31

The boundaries between districts are shown on the Zoning Map. Where uncertainty exists with respect to the boundaries of the various districts as shown on the map accompanying and made a part of this Ordinance, the following rules shall apply:

a.

Where the district boundary is a street, the boundary line shall be the centerline of the street.

b.

Where the boundary line is indicated approximately parallel to the street, it shall be taken as parallel thereto and, unless otherwise indicated, one hundred feet distant from the nearest street line. If there is any variance between the scaled distance from the boundaries to the street line and the distance as marked in feet upon the map, the latter shall govern.

c.

Where the districts designated on the map are bounded by lot lines, the lot lines shall be construed to be the boundary lines, unless the boundary lines are otherwise indicated on the map.

3.32

Where a zoning district boundary line divides a lot under single ownership at the time of the effective date of this Ordinance, (6/29/81) the regulations for each zoning district shall apply to portions of the lot within the respective districts except as provided in this Subsection 3.32.

3.32.1

Where more than one-half the area of said lot is in a less restricted district (either in terms of the district's overall regulations or a single regulation), any of the less restrictive dimensional regulation(s) may be extended up to twenty-five (25) feet into the more restricted district as-of-right for buildings or portions of buildings containing residential uses listed in Section 4.31 a-j or upon issuance of a special permit by the Board of Zoning Appeal for buildings or portions of buildings containing other uses. Uses not allowed in the more restricted districts shall not extend into the more restricted districts.

3.32.2

Gross floor area allowed in the more restricted district, according to the formulas specified in Subsection 5.25.5, may be located in the less restricted district, but gross floor area allowed in the less restricted district may be located in that portion of the lot located in the more restricted district only to the extent permitted in Section 3.32.1.

(Ord. No. 2025-1, 2-10-2025)