Maple Avenue Cambridge Mar. 20, 2020 GBH by Philip Martin.
Mathematician, Robert Winters has written an important February 16, 2021 post on residential density in the Cambridge Civic Journal. Winters notes that "even a relatively dense C-1 street like Cherry Street in The Port could see a 66% increase in density. Chalk Street (Res C) could see a 72% increase. Cornelius Way could have a 175% increase (that’s 2.75 times the current density). Near me, Antrim Street could go up 47%, Maple Ave. could go up 84%, and Lee Street could go up 50%. In the leafy western "suburbs", a Res B street like Appleton St. could go up 137% (2.37 times the current density) and Lakeview Ave. (a mix of Res A-1 and Res B) would nearly triple in density." Winters published the chart below of typical streets, what residential density they share now, and what density is being proposed for them in the Missing Middle Housing Petition, should it pass.
Maple Avenue, pictured above, which is in Mid-Cambridge (B and C-1 zones) is already very dense, with lots of existing MMH housing types. This street currently has a median FAR of .68, that could increase a staggering 84% if the MMH passes.
Antrim Street, pictured at the top of the CCC blog tab, also is in Mid-Cambridge (C-1). This street has a median FAR of .85. If the MMH passes, it could increase 47%. - between 1/2 and 2/3 larger than currently.
Any of the single- or multi-family houses on this street could be demolished and a larger structure 40 feet (4 story equivalent) could be built in its place.
For other Cambridge streets in our various neighborhoods, see his chart below. To determine the density increase proposed for your own home or that of your neighbors, we provide the formula below.
Curious what you will find? Check it out near the bottom of this post!
If a residence is larger than the allowable current FAR nothing is illegal. This just means the area was at one point down zoned after a certain optimum density had been reached.
What changes will MMH bring to your neighborhood? With MMH, every residence in the city would be up zoned to 1.25 FAR, larger than almost all structures in Cambridge residential areas today.
The two houses below offer important insights.
The single family East Cambridge house on the left is in the C-1 area (a home well known for its backyard “neighborhood farm”) is now zoned for 3 units. Under the MMH, but an investor could buy it, demolish this home and replace it with a large 40 foot tall modern box-style building for 13 small studio apartments (3 affordable with inclusionary. More likely there would be only 9 units created (and zero affordable to avoid Inclusionary impacts), each renting for c. $3,000 a month (not the kind of housing middle-income residents are looking for. The number of people living on this one property in an already very dense neighborhood would increase vastly. Nearby luxury town houses are beginning to appear. Bold contemporary style homes can be great if designed well, but these will likely increase the cost of housing in this neighborhood, and we would lose both this wonderful older home and its adjacent neighborhood farm.
A single family Mid-Cambridge home with a garage was recently purchased by a developer after the owner passed. This house was built as a 1 family but was converted to a 3 family about 50 years ago. Their garage is being replaced with a new infill single family market-rate (luxury) residence (see rendering on the right), built in a contemporary box-style, whose design reflects nothing of the neighboring homes. With MMH the height of the structure (now about 25 feet) could increase to 40 feet (nearly double) and without the cornice detail separating the second story from the third, mansard roof. The new structure would dwarf those around it and would be even more out of keeping with the housing fabric of nearby residences.
House in East Cambridge House in Mid-Cambridge with an Auxiliary home behind it.
How do you find the density of your own (or your neighbor's) home currently and how much it can be increased with the MMH ? Here is how you can find out what would happen to your residence or more importantly that of your neighbor, were it to be purchased, demolished, and rebuilt under MMH by an investor.
Here is what would happen to your residence or more importantly that of your neighbor, were it to be purchased, demolished, and rebuilt under MMH by an investor.
How to determine the FAR of any Cambridge residence in 3 easy steps – and how that will change
What are the core proposed changes in the MMH:
The last change would encourage large flat-roofed box-like structures in every neighborhood whether or not they fit with the homes that already exist there.
While we all want more affordable housing in Cambridge, the MMH would let investors and developers buy up property throughout the city, or add additional structures to it or in the back yard, and even demolish still functional historic housing and build new structures - all without design guidelines or review and at a density, height, and scale that often significantly differs from others in residential and mixed residential-commercial areas at present.