The presentation, dated March 11, 2019, includes slides used to present the information necessary to understand the rationale for zoning changes, the location of the zoning areas under consideration and the charts, tables and maps that help describe the situation. The proposed zoning changes, especially articles 6, 7, 8, 11 and 16, only cover changes affecting about 7% of the Town, those parts of the Town that are currently zoned R4-R7 and the B zoning districts.
Related articles
Some years back, I took a bus ride to a climate rally in New York City with a bunch of other activists. My seatmate was 12 years old, a smart kid from the suburbs who had never been to New York. As we approached Manhattan on the Cross Bronx Expressway, he looked out at a block of concrete apartment buildings and said something like: This is what happens when you don’t care about the environment. Actually, I replied, this is green living: People live close together; they can walk or take public transit; they live in apartments, share walls and heat and are relatively energy efficient; their carbon footprint is far lower than a family in a “green”, leafy single-family suburban house.
But my traveling companion was not altogether wrong about what he saw: New York, Boston, and every other city are now at pains to make a humane, equitable adaptation to a changing climate. We don’t want to create living spaces that bake in the sun’s heat, that have no shade or greenery or open space, surrounded by asphalt and highway, beset with deadly particulate pollution, flooding risk, and polluted stormwater runoff. Heat and air pollution are an expensive and deadly burden that fall especially heavily on low- and middle-income folks — a burden cruelly increasing with climate change.
As we decide what kinds of housing we are going to encourage in Arlington, we can do things in a more compassionate and inclusive way. We can incorporate environmental and aesthetic concerns, while allowing a mix of housing types that accommodate people of diverse incomes, family sizes, and life stages.
We can address both the climate crisis and the crisis-level housing shortage in Greater Boston. Environmental concerns are not a reason to say no to new housing. Rather, they are a part of the housing solution, in Arlington and regionally.
As Laura Wiener detailed in another post, The Housing Corporation of Arlington development at 10 Sunnyside (between Broadway and Mystic Valley Parkway, near Route 16), is an excellent example of implementing environmental/sustainability measures in an affordable (i.e. income-subsidized) multi-family dwelling. It is Passive House certified: An extremely stringent standard, using a combination of advanced and repurposed materials, high- and low-tech, to provide human comfort while bringing energy use to an absolute minimum.* The development features plentiful bike parking and a roof garden. It converts previously impervious pavement to landscaping, like planters, where stormwater can infiltrate the ground rather than carrying unfiltered pollutants into Arlington’s water bodies.
Another example of green infrastructure lives charmingly and unassumingly on some of our street corners. In 2020, Arlington installed rain gardens at the corner of Milton Street and Herbert Road in East Arlington. These little curbside oases act as a kind of green filter for storm water, catching pollutants (Fertilizer! Salt! Dog poop! Oil! Brake dust!) before they reach Alewife Brook and the Mystic River. Perhaps co-sited with new housing, wider buildout of rain gardens could keep nutrient pollution out of Spy Pond, preventing nasty algae growth which literally suffocates other aquatic life.
A caveat: We must take care not to load so many creative requirements onto new housing that it doesn’t get built at all. We need the housing. (See “The Problem with Everything-Bagel Liberalism” by Ezra Klein in the New York Times.) And under the new MBTA Zoning that we are required to implement, we must allow three-family housing in our new multi-family zones by right, i.e. without extra requirements or rigamarole.
But we could decide to add incentives to allow more housing above those requirements if such environmental improvements (rain gardens, green roofs, pollinator habitat, Passive House innovations, etc.) are included. Every new building is an opportunity for environmental adaptation. A vision for a greener, cooler, more inclusive Arlington takes shape. We can do this.
New housing development provides an opportunity to incorporate inclusive, environmentally friendly, win-win adaptations. Our environmental and housing goals must not be in tension with each other. With a coordinated approach, we can address the challenges of pollution, climate change, and our chronic and unjust housing shortage.
*As far as I can tell, only two other buildings in all of Greater Boston are Passive House certified: A new multi-family in Roxbury, and a single-family in Somerville.
Accessory Dwelling Units (aka “granny flats”)
The following information was presented to the Arlington Redevelopment Board in October, 2020 by Barbara Thornton, TMM, Precinct 16
This Article proposes to allow Accessory Dwelling Units, “as of right”, in each of the 8 residential zoning districts in Arlington.
Why is this zoning legislation important?
Arlington is increasingly losing the diversity it once had. It has become increasingly difficult for residents who have grown up and grown old in the town to remain here. This will only become more difficult as the effects of tax increases to support the new schools, including the high school, roll into the tax bills for lower income residents and senior citizens on a fixed income. For young adults raised in Arlington, the price of a home to buy or to rent is increasingly out of reach.
Who benefits from ADUs?
- Families benefit from greater flexibility as their needs change over time and, in particular providing options for older adults to be able to stay in their homes and for households with disabled persons or young adults who want additional privacy but still be within a family setting.
- Residents seeking an increase in the diversity of housing choices in the Town while respecting the residential character and scale of existing neighborhoods; ADUs provide a non-subsidized form of housing that is generally less costly and more affordable than similar units in multifamily buildings;
- Residents wanting more housing units in Arlington’s total housing stock with minimal adverse effects on Arlington’s neighborhoods.
What authority and established policy is this built on?
Arlington’s Master Plan is the foundational document establishing the validity and mission for pursuing the zoning change that will allow Accessory Dwelling Units.
Under Introduction in Part 5, Housing and Residential Development, the Master Plan states: Arlington’s Master Plan provides a framework for addressing key issues such as affordability, transit-oriented residential development, and aging in place.
The Master Plan states that the American Community Survey (ACS) reports that Arlington’s housing units are slightly larger than those in other inner-suburbs and small cities. In Arlington, the median number of rooms per unit is 5.7. There is a great deal of difference in density and housing size among the different Arlington neighborhoods. The generally larger size of homes makes it easier to contemplate a successful move to encourage ADUs.
What do other municipalities do?
According to a study (https://equitable-arlington.org/2020/02/16/accessory-dwelling-units-policies/), by 2017 65 out of 101 municipalities in the greater Boston (MAPC) region allowed Accessory Dwelling Units by right or by special permit. The average number of ADU’s added per year was only about 3. But by 2017, Lexington had 75 ADUs and Newton had 73. Both of these communities were among about 10 “as of right” municipalities in the MAPC region. This finding suggests that communities with more restrictions are less likely to see any significant affordable housing benefits.
Even in the midst of a housing crisis in this region, according to Amy Dain, housing expert, (https://equitable-arlington.org/2020/02/18/zoning-for-accessory-dwelling-units/) most municipalities still have zoning laws that restrict single family home owners from creating more affordable housing.
And this is despite the fact that, as according to Banker & Tradesman, March 10, 2020: https://www.bankerandtradesman.com/63-percent-in-greater-boston-back-adus/, 63% of people in the region approve of ADUs. California has recently passed strong pro-ADU legislation. A study by Zillow further corroborated this strong interest in communities across the US, including our region. https://equitable-arlington.org/2020/03/10/adu-popularity/.
Learn more about Accessory Dwelling Units/ “Granny Flats” here: https://planning.org/knowledgebase/accessorydwellings/

An ADU is a separate, smaller living unit with its own kitchen and bathroom facilities and separate entrance that is included within a larger resident (type 1), attached to a residence (type 2) or located in an accessory (“detached”) structure on the same lot as a main residence (type 3). For a variety of reasons, primarily cost and feasibility, the type 1 ADUs are by far the most common.
Article 43 on Arlington’s warrant for Spring 2021 Town Meeting would allow accessory dwelling units in connectin with single-family dwellings, two-family dwellings and duplex dwellings, as long as the ADUs can conform to dimentional requirements in existing zones (aka R0, R1, R2, B) and all code requirements. These dimensional requirements including setbacks, side yards, height, etc.
The sizes of these ADUs are determined by the size of the finished area of the specific home and must meet the dimensional requirements of the zoning district. Many homes in Arlington may not qualify for a Type 2 (attached) or Type 3 (detached) ADU. This chart shows the probable average square footage size of an ADU in each of the Town’s 21 precincts. There is a considerable difference, ranging from 479sf in precinct 4 to 885sf in precinct 8. The town wide average is 652 sf, not very big but a perfect size for an individual looking for a smaller, less expensive home in Arlington. No matter how big the home, the maximum size is capped at 900sf.
The discussions on zoning have been confusing because while zoning covers ALL of Arlington’s land and the zoning bylaws for all Arlington’s zones are referenced, the key issues of greatest interest to Town Meeting are the discussions about increasing density. These discussions pertain ONLY to those properties currently zoned as R4-R7 and the B (Business) districts. These density related changes would affect only about 7% of Arlington’s land area. The map shows the specific zones that would potentially be affected. They lay along major transportation corridors.

Dave Weinstock, an Arlington resident interested in affordable housing wondered about the concept of “developer math”. The math involved in planning an affordable housing projects is a problem that needs to get solved in order to have anything built here in Arlington, or anywhere. This topic comes up frequently in community discussions about the need for more housing.
Questions are raised around:
- 1- Why build so many units vs. smaller buildings
- 2- Why parking is costly and inefficient use of land
- 3- Why can’t more affordable or all affordable units be built?
- 4- The cost of subsidizing affordable units and how that may translate to higher rental rates/costs, etc.
Dave found a great Architecture and Development firm in Atlanta (Kronberg Urbanists + Architects, based in Atlanta GA) that lays out a nice presentation, includes sample proformas, and real life scenarios that may help us understand this piece of the puzzle better when evaluating any project and how developers may be incented to build certain types of projects or do certain types of work.
Here is a link, reformatted to be within this website, to the presentation, showing the varieties of choices, costs, formulas and outcomes developers consider before deciding if the project can be built: https://equitable-arlington.org/developer-math_kua_071420/
Much of our hope for more affordable housing depends on the market forces of capitalism and the willingness of developers to build for good, not just for profit. But the developers must be able to cover their costs. Many communities are highly skeptical of developers, assuming the community will get tricked, the developer will get greedy and the promised housing will be a disappointment. Trust is needed. But so is verification. We all need to learn the developer math.
What are the math factors that a developer considers before deciding to build affordable housing?

Here is a link to the original presentation. https://www.kronbergua.com/post/mr-mu-let-s-talk-about-math
Minneapolis is the most recent governmental entity to disrupt the almost 110 year old idea of local zoning in America by overriding single family zoning. Zoning was developed in the the early 1900’s to control property rights and, in part, to limit access to housing by race. These early laws were upheld by the courts in the 1930’s and the use of zoning to control private property for the interests of the majority became common. Houston Texas did not adopt zoning, an outlier in the nation.
But recently governments are rethinking zoning in light of evidence of exclusionary practices including racism and inadequate supplies of affordable housing. In July Oregon’s legislature voted to essentially ban single family zoning in the state.
Most recently, in the end of July, Minneapolis became the first city this century to remove single family zoning, allowing two family housing units to enter any single family zone as of right. According to the Bloomberg News article, the city took action to remedy the untenable price increases do to single family homes taking a disproportionate amount of city land and services. They hope a wider range of housing, and more housing, will reduce housing costs in the future.
Read the full story from Bloomberg News.
It’s New Year’s eve and I’m determined to get my third and final “Arlington 2020” article written and posted before 2021 rolls in. I’ve written these articles to paint a picture of Arlington’s housing stock, and how our housing costs have changed over time. The first article looked at the number of one-, two-, and three-family homes and condominiums in Arlington. The second article looked at how the costs of these homes has varied over time.
In this article, I’m going to look at the per-unit costs for our different housing types. The per-unit cost is just the assessed value, divided by the number of units. For condos and single-family homes, the unit cost is simply the assessed value. For two-family homes, it’s the assessed value divided by two. For a ten-unit apartment building, it’s the assessed value divided by ten. We’ll look at the price ranges within housing types, as well as the general differences between them.
The information here doesn’t include residential units from Arlington’s 76 mixed-use buildings. (My copy of the assessor’s data doesn’t distinguish between residential and commercial units in these buildings; I’ll try to say more about them in 2021.) It also omits units owned by the Arlington Housing Authority.
Condominiums
Condominiums provide the most variety and cost diversity. A condo can be half of a duplex, or part of a much larger multi-family building. The low end of the scale tends to be 500–600 square foot units that were built in the 1960’s; the high end tends to be more spacious new construction.

This graph is a histogram, as are the others in this article. The horizontal axis shows cost per unit, and the vertical axis shows the number of units in each particular cost band.
The per-unit price distribution is
| min | 1st quartile | median | mean | 3rd quartile | max |
| $92,600 | $344,450 | $473,100 | $500,086 | $640,850 | $1,241,000 |
Single-family homes
Single family homes are heavily concentrated around the $700,000 mark. There’s very little available for less than a half million dollars.

Per unit rice distribution:
| min | 1st quartile | median | mean | 3rd quartile | max |
| $103,700 | $679,900 | $771,900 | $825,172 | $908,750 | $3,232,700 |
The $103,700 single-family home deserves some explanation. The property straddles the border between Arlington and Lexington; it appears that the $103k assessed value reflects the portion that lies in Arlington.
Two-family Homes
Two-family homes are the bread and butter of East Arlington; they’re also common in the blocks off Mass ave near Brattle Square and the heights. Many of these homes are older and non-conforming, and they’re gradually being renovated and turned into condominiums.
As a reminder, these are costs per unit (as opposed to the cost of the entire two-family home).

Per unit price distribution:
| Min | 1st quartile | median | mean | 3rd quartile | max |
| $209,050 | $440,550 | $472,000 | $479,175 | $508,588 | $1,140,450 |
Three-family Homes
Unlike Dorchester and Somerville, three-family homes are not a staple of Arlington’s housing stock. But we have a few of them. Most were built between 1906 and 1930.

Per-unit price distribution:
| Min | 1st quartile | median | mean | 3rd quartile | max |
| $227,567 | $313,733 | $336,950 | $344,292 | $362,600 | $719,000 |
Small Apartments (4–8 units)
The majority of Arlington’s small apartment buildings were constructed during the first half of the 20th century. The most recent one dates from 1976.

Per-unit price distribution:
| Min | 1st quartile | median | mean | 3rd quartile | max |
| $154,950 | $202,950 | $227,775 | $231,619 | $255,775 | $403,875 |
Large Apartments (9+ units)
You’ll see three outliers in the per unit-cost distribution for large apartment buildings. These correspond to the newest apartment complexes in Arlington: The Legacy (2000), Brigham Square (2012), and Arlington 360 (2013).

Per-unit price distribution:
| Min | 1st quartile | median | mean | 3rd quartile | max |
| $117,013 | $141,383 | $153,006 | $195,789 | $170,973 | $474,631 |
All combined
Finally, we’ll put it all together in one picture, representing nineteen-thousand and some odd homes in town.

Per-unit price distribution:
| Min | 1st quartile | median | mean | 3rd quartile | max |
| $92,600 | $417,175 | $555,825 | $587,975 | $759,900 | $3,232,700 |
While there are lower-priced options available, a person coming to Arlington should expect to buy (or rent) a property that costs just shy of half a million dollars (or more).
Here is a spreadsheet with the cost distributions mentioned in this article.
This 102 page document is the most recently revised set of recommendations by the Town of Arlington’s Redevelopment Board. The report takes into consideration the comments and information provided over the last few months’ public hearing process. It also incorporates a citizen petition which strengthens the case for increasing permanent affordable housing with the passage of these zoning related Articles. Town Meeting convenes on April 22, 2019.