> DO YOU THINK THAT 125 (= 25%) OF AFFORDABLE UNITS IS ENOUGH TO COUNTER-BALANCE THE EFFECT OF 377 (=75%) LUXURY UNITS? I DON'T.
I don't think there's any "counter-balancing" needed. 377 market-rate
units is a positive for the area and will help with our housing crisis,
and so will 125 affordable/income-restricted units.
There's research showing new high-end market units slow (or reverse)
rent increases even (especially!) at the low end of the market. See, for
example,
https://www.pew.org/en/research-and-analysis/articles/2025/07/31/new-housing-slows-rent-growth-most-for-older-more-affordable-units
(which I think has been shared here before).
The effect:
"Pew’s analysis of the 1,654 ZIP codes tracked by Zillow throughout U.S.
metropolitan areas suggests that every 10% increase in a market’s
housing supply (using American Community Survey data) from 2017 to 2023
correlated with rents growing 5% less from 2017 to 2024, controlling for
a variety of factors."
"Looking at more than 41,000 large apartment buildings in 223 metro
areas, there was a clear trend: Class C rents decreased more, relative
to those for units in Class A buildings. In high-supply metro areas
(those that increased their housing stock by at least 10% from 2017 to
2023), rent growth was slower than in average markets. Crucially, rent
growth slowed most for Class C units, demonstrating that the additional
supply was especially helpful to people living in lower-cost apartments.
(See Figure 3.)"
The mechanism: "Even though new housing is usually expensive, the reason
for the decline in Class C rents is straightforward. Economist Evan
Mast, an assistant professor at the University of Notre Dame, has
documented that when new apartments are built in high-income
neighborhoods, they set off moving chains. The new residents of those
homes tend to move in from high-income neighborhoods, but the people who
move into the homes they vacate come from slightly less affluent
neighborhoods, and so on. The chains quickly reach communities with
below-average incomes, freeing up as many as 70 homes there for each 100
market-rate (unsubsidized) homes built in high-income neighborhoods,
according to Mast’s research."
At a more local level, while people worry about gentrification, there's
research showing that new construction tends to be a *response* to
already changing neighborhoods, and acts to slow the increase in rents
(perhaps from "very fast" to "fast", so the perception can be that it's
making matters worse). According to
https://www.lewis.ucla.edu/2021/07/07/05-market-rate-development-and-neighborhood-rents-with-evan-mast/,
"New buildings decrease nearby rents by 5 to 7 percent relative to
locations slightly farther away or developed later, and they increase
in-migration from low-income areas. Results are driven by a large supply
effect—we show that new buildings absorb many high-income
households—that overwhelms any offsetting endogenous amenity effect. The
latter may be small because most new buildings go into already-changing
areas. Contrary to common concerns, new buildings slow local rent
increases rather than initiate or accelerate them." and "suggesting that
new buildings reduce costs in lower segments of the housing market, not
just in the high-end units that are the most direct competitors of new
buildings".
~~Alex
On 2/6/26 14:41, 'JOSIAH AUSPITZ' via Davis Square Neighborhood Council
wrote:
> PJ,
> RESPONSE IN CAPS BELOW
> LEE
>> On 02/04/2026 4:37 PM EST PJ Santos <
peej...@gmail.com> wrote:
>> Is this segment being over served necessarily a bad thing? Boston
>> recently overbuilt lab space, and now that the market has crashed lab
>> prices are very low.
>> Obviously the housing market is much larger and more complex, but it
>> would be nice if we over supplied a segment of it and caused prices to
>> go down.
> IF, AS YOU RIGHTLY POINT OUT, THERE IS A REALISTIC CHANCE OF A COLLAPSE
> IN ONE-BEDROOM RENTS IN THE $4125/MO RANGE, COPPER MILL WOULD BE WELL
> ADVISED TO RADICALLY RESTRUCTURE, DELAY OR WALK AWAY FROMTHE 275' TOWER
> PROJECT.
> Additionally, the boundaries between segments of the housing market are
> porous. Many people in "B" grade housing would move to "A" grade housing
> if prices decreased. Similarly, some people living in "family-sized"
> units with roommates would move to studios or 1 bedrooms if the right
> apartment was available to them.
> POROSITY IS A TWO-WAY STREET. IF--- A BIG IF-- LOW AMENITY SINGLE
> BEDROOM LUXURY HIGH RISE APARTMENTS WERE SUCCESSFULLY RENTING IN DAVIS
> SQ AT $51k/YR + ~$5K/UTILITIES, THIS WOULD LIKELY EXERT AN UPWARD PULL
> ON CONDOS AND RENTALS IN TWO AND THREE FAMILY HOMES.
> In another email thread we looked at Somerville's "Housing Needs
> Assessment" (City of Somerville, Massachusetts - File #: 25-1668
>
https://somervillema.legistar.com/LegislationDetail.aspx?
> ID=7730934&GUID=316FD810-9AB7-4D17-8CF0-66A396784BF9 <https://
>
somervillema.legistar.com/LegislationDetail.aspx?
> ID=7730934&GUID=316FD810-9AB7-4D17-8CF0-66A396784BF9>) , one of the most
> <mailto:
jlau...@comcast.net>' via Davis Square Neighborhood Council
> <
daviss...@googlegroups.com <mailto:
daviss...@googlegroups.com>>
> wrote:
>
https://www.wgbh.org/news/local/2026-02-03/housing-and-transparency-at-
> the-top-of-agenda-for-somervilles-new-mayor <
https://www.wgbh.org/news/
> local/2026-02-03/housing-and-transparency-at-the-top-of-agenda-for-
> somervilles-new-mayor>
> Note this quote:
> "I want to [have]more two and three bedroom affordable units. It’s one
> thing to build a lot of studios and ones, building twos and threes
> allows us to keep working families in the city."
> By contrast, the Copper Mill proposal has the minimum 2-3 bedroom
> units required under 40B. Studios and one -bedroom units predominate.
> The one-bedrooms are projected to rent for $4250/month-- that's $51K/
> year plus ~$5K for utilities. This can succeed in the current market
> only by tapping the "luxury" apartment segment, including bloc corporate
> rentals, a new departure and gentrification accelerator for Davis
> Square. The risk is that this very segment is increasingly overserved
> in metropolitan Boston-- e.g. with office-to-resident conversions and
> new buildings with amenities lacking in the Copper Mill plan.
> Lee
> Lee
> _________________
> Josiah Lee Auspitz
> 17 Chapel Street <
https://www.google.com/maps/search/17+Chapel+Street+
> %0D%0A+%0D%0ASomerville,+MA+02144?entry=gmail&source=g>
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https://www.google.com/maps/
> search/17+Chapel+Street+%0D%0A+%0D%0ASomerville,+MA+02144?
> entry=gmail&source=g>
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617-628-6228 fax:
617-628-9441/
> /Phones do not receive text messages/
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