Experts advise form-based codes, caution against relying solely on market as Cambridge debates multifamily zoning reform

Cambridge City Councilors and planning staff on the Neighborhood and Long Term Planning Committee spent more than three hours hearing urban planners from MIT and Harvard discuss the city’s multifamily housing proposal, with presenters urging clearer links between zoning changes and the city’s Envision Cambridge plan, recommending form‑based codes and visualizations, and warning that relying only on market forces is unlikely to produce broad affordability quickly.

The discussion centered on how a draft zoning reform – described by council members as a citywide allowance for more multifamily housing in residential districts with options for additional height tied to inclusionary requirements – would translate to the spatial and social outcomes envisioned in Envision Cambridge. Professors Chris Zegras (Department of Urban Studies and Planning, MIT), Jeff Levine (associate professor of the practice, MIT), and Maurice Cox (Professor in Residence, Harvard Graduate School of Design) presented experiences and case studies from Somerville, Portland (Maine), Detroit and other cities.

Why it matters: Cambridge’s strategic plan, Envision Cambridge, lists housing and urban form among its top priorities. Committee members and presenters agreed the city needs more housing and must reform zoning to address affordability, but several experts urged that zoning change be paired with clear design standards, monitoring and, in many cases, public subsidy to secure middle‑ and working‑income housing.

Most important takeaways

- Form‑based codes and visualization: Multiple speakers recommended translating the city’s vision into parcel‑level form standards or pattern books so residents and developers can see what new development would look like. "Form‑based codes help reflect the spatial patterns... They prioritize the size, shape, and placement of buildings, not the use per se," Professor Chris Zegras said.

- Zoning alone is not a panacea: Zegras and Levine both cautioned that zoning reform by itself rarely produces immediate affordability. "Zoning reform is not a panacea to the affordability crisis," Zegras said. Levine added, "This stuff takes a long time," and urged patience while stressing the importance of parallel tools such as subsidies or incentives.

- Examples from other cities: Presenters described Portland, Maine’s Recode effort (two phases that ultimately allowed multifamily in more zones, reduced parking requirements and maintained affordable‑housing density bonuses), Somerville’s hybrid form‑based approaches, and Detroit’s Brush Park work, which paired a form‑based code and pattern books with public investments to achieve a mix of market and deed‑restricted units.

- Inclusionary requirements and subsidies: Cambridge’s current inclusionary zoning requirement (referenced in the meeting as 20% of units on projects of 10+ units) was discussed at length. Speakers said higher inclusionary targets typically require public subsidy or other incentives to be financially feasible. Levine noted Portland’s increase from 10% to 25% and the financing challenges that followed; Cox and others said municipal bonds or targeted development subsidies can make deeper affordability achievable.

- Implementation tools and appeals risk: Presenters compared nondiscretionary site‑plan review (standards that must be met) with discretionary special‑permit processes that are easier to litigate and can delay projects. The committee discussed a proposed threshold change (previously a special permit threshold at roughly 50,000 square feet, raised in the draft to 75,000 square feet). Experts said site‑plan review with clear standards can shape form without producing as much litigation risk as discretionary reviews.

Committee process and next steps

No final zoning vote occurred at the meeting. Council members pressed presenters on specifics (setbacks, open‑space targets, what a 4‑ or 6‑story building would look like on a typical Cambridge lot) and on how the proposal would produce the mix of middle‑income, workforce and lower‑income units the city wants. Several councilors emphasized the need for continued, focused community engagement and for the city to present build‑out scenarios that show where new housing is likely to appear.

A formal procedural vote did occur: the committee voted to extend the meeting by 15 minutes to 3:15 p.m.; five members voted yes.

Select direct quotations (first reference with role/title): "Zoning reform is not a panacea to the affordability crisis," said Christopher (Chris) Zegras, professor and head of the Department of Urban Studies and Planning at MIT. "This stuff takes a long time," Jeff Levine, associate professor of the practice at MIT, told councilors when asked about how quickly zoning changes produce housing. "Take the time to visualize the urban life that we want," Maurice Cox, Professor in Residence at the Harvard Graduate School of Design, advised when describing form‑based codes and pattern books.

Background and context

Committee members repeatedly returned to Envision Cambridge, the city’s comprehensive vision referred to throughout the meeting as the document that should guide zoning changes. Councilor Azim (who described prior work on statewide rezoning efforts) summarized draft projections referenced by staff and presenters: roughly 5,000 new units over 15 years under the proposal discussed, with about 1,000 of those projected to be affordable unit equivalents — figures discussed in the meeting by council members and outside experts. Presenters stressed these are projections and that outcomes depend on market conditions, financing, and supplemental public policy.

What remained unresolved in the meeting

- Exact open‑space and setback standards tied to the draft zoning text (speakers encouraged context sensitivity rather than a single uniform answer). - Whether the council should adopt a broadly permissive citywide approach now and then refine it parcel‑by‑parcel with form‑based rules and design guidelines, or take a slower phased approach before adopting citywide changes. - The degree to which the city will finance deeper affordability beyond the existing inclusionary requirement; speakers noted public subsidy (bonding or other tools) has been essential in places that achieved higher shares of deed‑restricted units.

Ending note

Presenters and councilors agreed on two practical points: (1) zoning change is necessary given the city’s housing shortfall and an antiquated code, and (2) zoning change should be accompanied by visualization, standards and measurement (dashboards) so Cambridge can monitor whether reforms produce the spatial and affordability outcomes described in Envision Cambridge.

Speakers quoted in this article appear in the meeting transcript; the committee did not take a final vote on the zoning reform at this session.