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Table
2: Proposed Detached Single-Family
"House Type" Assignments and Resulting Change in Nonconformity as
of 11/1/20
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House Type Assignment Equations
Reverse-Engineered by NewtonRezoning.org. [1] Aggregate Single-Family
Nonconformity rises from 53.5% to 94.4% with House Types C & D rising to
99%
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House Type Assignment [2]
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A
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D
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C
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B
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All
Single-Families
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Story Number Limit for House Type
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2.5
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1
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1.5
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2.5
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Footprint Limit for House Type in sq. ft.
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2,400
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2,300
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1,200
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1,400
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Districts where House Type is allowed by right
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R1
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R1,
R2 with Special Permit
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All
Districts
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All
Districts
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Equations currently used for House Type Assignment in R1
Story Number and Footprint refer to existing house on lot.
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A)
If 3>StoryNum >=2 and
Footprint >1,600 sq. ft.
or
B) If StoryNum >1 and
Footprint >= 1,800 sq. ft.
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If
StoryNum=1 and Footprint >=1,500 sq. ft.
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A)
If 2> StoryNum >1 and
Footprint <1,800 sq. ft.
or
B) If StoryNum=1 and
Footprint <1,500 sq. ft.
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All
Houses Not Fitting the Equations for A,C,D
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Equations currently used for House Type Assignment Outside of R1
Story Number and Footprint refer to existing house on lot
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If StoryNum >1 and Footprint >2,200 sq.
ft.
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If
StoryNum=1 and Footprint >=1,800 sq. ft.
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If StoryNum < 2 and Footprint < 1,800
sq. ft.
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Number of Homes in R1
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2,253
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563
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82
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555
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3,453
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Number of Homes in R2,R3,R4,N
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986
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1,255
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2,300
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8,940
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13,481
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Total Number of Homes
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3,239
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1,818
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2,382
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9,495
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16,934
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Ave Lot Size Sq. Ft.
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20,256
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13,807
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8,429
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9,313
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11,765
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Ave Living Area Size Sq.
Ft.
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4,004
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2,067
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1,586
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2,351
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2,529
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% Homes nonconforming with CURRENT side/rear setbacks
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52.4%
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60.7%
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56.9%
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51.6%
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53.5%
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% Homes nonconforming with PROPOSED Side/Rear Setbacks
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80.2%
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85.8%
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86.8%
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82.4%
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82.9%
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% Homes nonconforming with footprint and story height limit
defined by house type [3]
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54.6%
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55.3%
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89.5%
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53.3%
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58.83%
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% Homes nonconforming for being outside allowed district for
House Type [3]
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30.5%
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69.0%
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0.0%
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0.0%
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13.24%
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% Homes nonconforming with PROPOSED story height, footprint,
district, and side/ rear setbacks.
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94.2%
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99.1%
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98.6%
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92.5%
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94.4%
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Data
Exclusions: Estimate of Single-Family Houses = 17,087. Data was excluded if
houses A) were not in a Residential District in
current and proposed zoning, B) were
not assumed to be a detached single family house by both the Newton Assessors
Database and Sasaki, C) If Sasaki only had a zero story height for the house.
This eliminated 153 houses, leaving a sample size of 16,934 single family
homes.
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[1] Equations are empirically checked against
16,917 House Type Assignments and predicted the assignment in 16,914 cases. A
spreadsheet "HouseTypeEquationCheck" showing the empirical results
was sentto ZAP.
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[2] Zoning Specs. from 8/7/20 Planning Department
memo. Sasaki Measurements and proposed
districts from 2019 Build-Out Analysis.
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[3] The high nonconformity for Type C is because
1,144 out of 2,382 Type C homes have more than 1.5 stories and Type C only
allows 1.5 stories. The high nonconformity of Type D is because Type D is
only allowed by right in R1, but most Type D Houses are not in R1.
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