 1923 Cambridge Zoning Map Cambridge’s multifamily-housing amendment (MFH), adopted February 10, 2025, was intended to create more housing by allowing multifamily and townhouse residences across nearly the entire city. It also removed minimum lot sizes, lot widths, lot area per unit, and general residential FAR limits. Four stories and 45 feet are available as of right in the new C-1 district. On qualifying lots of at least 5,000 square feet, an inclusionary project may reach six stories and 74 feet if it satisfies the inclusionary requirement—currently 20 percent of residential floor area.[1][3] The new rules have raised concerns about demolition, incompatible construction, loss of relatively affordable homes, tenant displacement, tree removal, reduced green space, parking, and infrastructure. Unit counts alone do not determine whether new housing meets Cambridge’s needs; size, affordability, family suitability, and neighborhood impact also matter. Before MFH, the former C-1 district was already one of Cambridge’s higher-density (capacity) residential districts. It allowed multifamily housing, a 0.75 residential FAR, a 35-foot height limit, minimum lot dimensions and lot area per dwelling unit, defined yards and open space, and special-permit rules for larger projects.[1] The proposals below preserve multifamily housing citywide and allow more development than the former A, B, and C districts generally permitted, while restoring selected limits and directing the greatest scale to locations better able to absorb it. See below the comparison of our proposed amendments and those of CDD . Proposed amendments 1. Establish a citywide residential baseline. Apply many of the former C-1 standards throughout residential areas across the city without resuming former restricted neighborhood zoning: a 5,000-square-foot minimum lot, 50-foot minimum lot width, and one dwelling unit per 1,200 square feet of lot area, with density addressed more fully in Amendment 9. Retain the four-story/45-foot envelope, restore appropriate side- and rear-yard formulas, and require 30 percent total open space, including 20 percent at-grade permeable space and 10 percent private space. At least 30 percent should be usable, ground-level green space with a continuous dimension of at least 15 feet. Parking, driveways, loading, storage, and narrow residual strips should not qualify. No general residential FAR limit is proposed. 2. Reserve six stories and 74 feet for appropriate growth locations. The 45-foot/four-story envelope should remain broadly available. The six-story/74-foot pathway should be limited to major thoroughfares, squares, major corners, and other designated growth locations on sites of at least 5,000 square feet. A 39-foot increase over the former C-1 height limits is excessive; interior residential streets and major corridors do not have the same capacity. The ordinance should clarify corner-lot measurements, rooftop structures, and height definitions, while existing multifamily design guidelines should become objective standards where feasible.[5][6] 3. Require public design requirement for projects. A project using the six-story/74-foot pathway should remain as of right only if it meets objective requirements, and there should be a complete a publicly noticed CDD design and site-review consultation with neighbors and the developer before a building permit is issued. Preliminary plans must be available to the public in advance. CDD, technical staff, and the design team must address urban design, neighborhood context, transportation, environmental, landscape, and historic issues. The applicant must respond to comments in writing, and CDD must publish a meeting summary and compliance determination. This would not be a special permit or authorize denial of a compliant project. 4. Require public review of demolition and major additions. Demolition of buildings at least 50 years old should continue under Chapter 2.78, but no final sign-off should occur until public notice, access to plans, and an opportunity for comment with the owner or developer along with city staff.[2] The same process should apply to a “Major Addition,” whether or not demolition is proposed. Thresholds could include a 25 percent increase in above-grade floor area, adding a story, expanding the footprint by 15 percent or more, substantially changing the roofline, or altering 25 percent of a publicly visible facade. Review should consider preservation, a smaller replacement, family-sized or affordable housing, compatibility, historic or environmental value and costs, as well as full energy-code compliance. Limited setback relief may preserve a significant existing building but should be no broader than necessary. 5. Protect green space, trees, and neighborhood setbacks. Front setbacks should be the greater of the former C-1 formula or the average setback of the two adjacent principal buildings. Side and rear yards should generally restore former C-1 standards rather than defaulting to five feet. For each story above four, require two additional feet of side and rear setback. Limited “sum-to” flexibility could shift yards if total depth is maintained, no new wall should be closer than five feet to a lot line, mature trees are preserved, and the front setback is not reduced. The City should study maximum wall lengths, articulation, upper-story stepbacks, and tree-preservation based on most impactful design principles on the neighbors and the neighborhood.[6] 6. Tie increased development capacity to family-sized housing. Projects with 10 or more units, or exceeding 35 feet or three Stories Above Grade, should provide at least 30 percent two-bedroom-or-larger units, rounded up. A waiver should be limited to the physically infeasible amount and require a written Planning Board finding. The standard should apply to market-rate and inclusionary units. A limited exception could apply to purpose-built student housing within a 20-minute actual walk of a campus, with enforceable student-occupancy limits. A project otherwise eligible for four or more stories should be limited to 35 feet and three stories if average residential GFA exceeds 2,000 square feet per unit. Habitable basement space should count except in mapped flood-hazard areas.[6] 7. Require tenant protection, accountability, and measurable outcomes. Before demolition or a Major Addition, applicants should report tenant households occupying the property during the preceding 24 months. Personal information should remain confidential; only aggregated data should be published. The City should track units and bedrooms before and after redevelopment; rents and sale prices; displacement; trees; green space; assessed values and tax burdens; infrastructure costs; hazardous materials; and parking, loading, curb, and transportation impacts. Existing annual and five-year housing reviews should become a public dashboard showing projects under review, plans, dimensions, compliance, permits, and consultation dates.[4] The City should implement the recommendations requested in unanimously adopted Policy Order 2026-123 and assign each action a responsible department, deadline, compliance measure, and reporting date. 8. Treat serial permits as one cumulative project. All demolition, construction, additions, and exterior alterations on the same lot during the preceding 24 months should be considered together, regardless of permit, phase, owner, developer, or lot changes. The rule should cover changes to floor area, height, footprint, open space, unit count, and development intensity. Routine maintenance, emergency work, accessibility improvements, replacement in kind, and work that does not materially increase exterior bulk should be exempt. The City should verify its own permit records so redevelopment cannot avoid requirements by being divided into smaller applications. 9. Establish one density rule and a voluntary affordability option. The maximum base density should be one dwelling unit per 1,200 square feet of lot area, rounded down, applied uniformly to new construction, replacement, additions, conversions, and increases in units. A project could exceed that limit as of right only if at least 20 percent of its final residential floor area is on-site, permanently affordable housing, calculated after additional units are included.[3] A project within the base density should not be required to provide 20 percent affordability solely because it meets an existing threshold. The option should waive only the unit-density limit; height, setbacks, open space, trees, flood, stormwater, fire, building-code, transportation, and historic requirements remain in force. The 1,200-square-foot figure is a policy choice based on an earlier CDD comparison, not a claim about the most recent former C-1 standard.[9] 10. Clarify as-of-right determinations and community engagement. A citizen petition should specify when an as-of-right determination is made, which official is responsible, and which objective zoning, design, neighborhood, transportation, environmental, tree, flood, and site standards apply. Before the determination becomes final, applicants should provide plans and participate in a publicly noticed advisory meeting with CDD, City staff, abutters, and residents. Comments and written responses should be public. The process should remain advisory and should not create an unlimited delay, special permit, or veto over a compliant project. Complementary measures Parking is a citywide Article 6 and transportation issue, not a former C-1 standard. The City should measure parking occupancy and curb demand; address loading, visitors, car-share, bicycle parking, and transit; require actual pedestrian-route analysis for sites beyond a defined 20-minute walk from rapid transit; and require designated loading for structures with nine or more units. A baseline of 0.25 off-street spaces per unit could apply to such projects, with a higher project-specific baseline where unmet curb demand is documented.[8] Implementation should also address demolition safety, hazardous materials, trees, stormwater, fire access, construction impacts, and infrastructure capacity. Housing-need analysis should be updated using current information about student demand, universities, biotech employment, and office occupancy rather than relying only on earlier projections.[7] Conclusion The goal is not to stop housing. It is to ensure that increased development rights produce housing that is family-suitable, reasonably affordable, and compatible with Cambridge’s streetscapes, trees, green space, infrastructure, and neighborhood life. These proposals preserve citywide multifamily housing and meaningful growth while restoring selected protections, directing the greatest height and density to appropriate locations, and requiring the City to measure whether the policy is producing the public benefits promised. Sources [1] Cambridge CDD, prior C-1 and neighborhood zoning comparison. [2] Cambridge Historical Commission, Demolition Review. [3] Adopted MFH ordinance, Part Two, including current open-space and inclusionary-housing rules. [4] Adopted MFH ordinance, §§1.80–1.83, cited above. [5] Cambridge CDD, Zoning for Multifamily Housing: Design Guidelines for Multifamily Housing. [6] Cambridge CDD, Citywide Multifamily Housing Zoning Update, draft, June 25, 2026. [7] “September 1 in Cambridge: Student Housing Demand Meets the Upzoning Pipeline,” August 30, 2026. [8] City of Cambridge, Parking Minimums/Maximums Policy Order, 2022. [9] Cambridge CDD, Riverside Neighborhood Protective Zoning Petition, May 17, 2016.  
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