What Is Cambridge’s Affordable Housing Overlay?

A controversial policy is helping create more affordable housing units in the Massachusetts city, but fears of overwhelming density are likely unfounded.

1 minute read

February 18, 2024, 5:00 AM PST

By Diana Ionescu @aworkoffiction


Aerial view of Cambridge, Massachusetts.

Cambridge, Massachusetts. | Wangkun Jia / Adobe Stock

An article by Laurel M. Shugart and Olivia W. Zheng in The Harvard Crimson explains the Affordable Housing Overlay, a policy that aims to increase affordable housing in Cambridge by waiving certain height limits and zoning restrictions for affordable housing developments.

As the article points out, “Though the specific height limits for AHO projects vary across the city, in general, they are allowed to exceed normal height limits by between five and 85 feet. The AHO also allows for projects that are twice as dense than normal developments or more.” AHO projects are also not subject to Planning Board approval, but must still undergo a design consultation process.

Amendments to the AHO passed by the Cambridge City Council last year expand height limits to 12 stories in the densest parts of the city and give developers a more flexible unit size.

According to the article, more than 700 affordable rental units have been proposed under the AHO. However, even its supporters acknowledge that, for better of worse, the policy won’t change the city overnight, and will make only a small dent in the state’s housing crisis.

Tuesday, February 13, 2024 in The Crimson

portrait of professional woman

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching. Mary G., Urban Planner

I love the variety of courses, many practical, and all richly illustrated. They have inspired many ideas that I've applied in practice, and in my own teaching.

Mary G., Urban Planner

Cover CM Credits, Earn Certificates, Push Your Career Forward

Logo for Planetizen Federal Action Tracker with black and white image of U.S. Capitol with water ripple overlay.

Planetizen Federal Action Tracker

A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

June 11, 2025 - Diana Ionescu

Metrorail train pulling into newly opened subterranean station in Washington, D.C. with crowd on platform taking photos.

Congressman Proposes Bill to Rename DC Metro “Trump Train”

The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

June 2, 2025 - The Hill

Large crowd on street in San Francisco, California during Oktoberfest festival.

The Simple Legislative Tool Transforming Vacant Downtowns

In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

June 2, 2025 - Robbie Silver

Color-coded map of labor & delivery departments and losses in United States.

The States Losing Rural Delivery Rooms at an Alarming Pace

In some states, as few as 9% of rural hospitals still deliver babies. As a result, rising pre-term births, no adequate pre-term care and harrowing close calls are a growing reality.

1 hour ago - Maine Morning Star

Street scene in Kathmandu, Nepal with yellow minibuses and other traffic.

The Small South Asian Republic Going all in on EVs

Thanks to one simple policy change less than five years ago, 65% of new cars in this Himalayan country are now electric.

3 hours ago - Fast Company

Bike lane in Washington D.C. protected by low concrete barriers.

DC Backpedals on Bike Lane Protection, Swaps Barriers for Paint

Citing aesthetic concerns, the city is removing the concrete barriers and flexposts that once separated Arizona Avenue cyclists from motor vehicles.

5 hours ago - The Washington Post