Cambridge is compliant with the MBTA Communities Act. The city adopted zoning that meets the state's multifamily requirement near its rapid transit stations on the Red Line, and the state has determined Cambridge compliant per the EOHLC approval list. The state required Cambridge to zone for a capacity of 13,477 units. For owners and investors, it can expand what you are allowed to build on a Cambridge parcel near transit.
What is Cambridge's MBTA 3A zoning?
Cambridge meets the MBTA Communities Act through zoning that allows multifamily housing by right near its rapid transit stations on the Red Line, which the state's Executive Office of Housing and Livable Communities has determined compliant. As a rapid transit community, Cambridge was required to zone for a capacity of 13,477 multifamily units, equal to 25 percent of its housing stock. The zoning means qualifying projects no longer need a special permit in eligible areas near Cambridge's rapid transit stations.
Which parts of Cambridge are in the district?
The Cambridge district focuses on parcels near its rapid transit stations on the Red Line, including Harvard, Central, Kendall, and Porter. Because the boundaries are parcel specific and some lots are excluded, the only reliable way to know if a given property is in the district is to check it against the city's adopted zoning map. Send us the address and we will look it up.
What can you build under it?
Inside the Cambridge district, multifamily housing is allowed by right at the densities the district sets, at a minimum of 15 dwelling units per acre. That can turn a parcel that previously allowed only a single home or a two family into one where a multifamily building is permitted without a special permit. The exact unit count depends on the lot and the district rules, so each parcel needs its own analysis.
What does this mean for Cambridge owners and investors?
If your parcel sits in the Cambridge district, your development potential and therefore your value may be higher than the old zoning implied. For investors, Cambridge's by right multifamily potential represents an opportunity in one of the strongest rapid transit markets on the corridor. For sellers, it is worth knowing whether your lot carries this upside before you price it, since it can change what a buyer will pay. For owners holding long term, the added development rights can sit on your balance sheet as future optionality. We run that analysis before clients buy, sell, or hold. For a deeper look at how zoning changes affect value, see our MBTA 3A property value analysis.
How do I find out if my Cambridge property qualifies?
Send us the address and we will confirm whether it falls in the district and what that allows, usually the same day. Or check it yourself against the city's adopted zoning map and look up whether your parcel is inside a district boundary.
Cambridge 3A detail
MBTA community category: Rapid Transit served by the Red Line
Required multifamily zoning capacity: 13,477 units
Capacity as share of housing stock: 25 percent
Minimum density: 15 dwelling units per acre
Rapid transit service: the Red Line (Harvard, Central, Kendall, and Porter stations)
State compliance status: Compliant, on the EOHLC approval list
Typical current multifamily price point: $2,100,000 (MLS PIN median sale, multi family, last 12 months, n=83)
Capacity figure from EOHLC official June 2025 capacity calculations. MLS PIN data reflects the trailing 12 month median sale price for multi family properties in Cambridge, MA.
Written by Ethan Piani-Hohmann, broker and founder of PH Realty Group, a Greater Boston brokerage focused on multifamily and investment property. Last updated June 2026
