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

Aerial view of town of Wailuku in Maui, Hawaii with mountains in background against cloudy sunset sky.

Maui's Vacation Rental Debate Turns Ugly

Verbal attacks, misinformation campaigns and fistfights plague a high-stakes debate to convert thousands of vacation rentals into long-term housing.

July 1, 2025 - Honolulu Civil Beat

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.

July 2, 2025 - Diana Ionescu

Map of Haussmann's redesign of Paris in the 1850s through 1870s under Napoleon III.

In Urban Planning, AI Prompting Could be the New Design Thinking

Creativity has long been key to great urban design. What if we see AI as our new creative partner?

June 30, 2025 - Tom Sanchez

Sign in front of building for seior services center in St. Petersburg, Fl.

Florida Seniors Face Rising Homelessness Risk

High housing costs are pushing more seniors, many of them on a fixed income, into homelessness.

15 minutes ago - WESH

Boston Red Line train with skyline in background.

Massachusetts Budget Helps Close MBTA Budget Gap

The budget signed by Gov. Maura Healey includes $470 million in MBTA funding for the next fiscal year.

1 hour ago - Smart Cities Dive

View down center of street in Milwaukee, Wisconsin

Milwaukee Launches Vision Zero Plan

Seven years after the city signed its Complete Streets Policy, the city is doubling down on its efforts to eliminate traffic deaths.

2 hours ago - Urban Milwaukee

Urban Design for Planners 1: Software Tools

This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.

Planning for Universal Design

Learn the tools for implementing Universal Design in planning regulations.

Associate/Senior Planner

Gallatin County Department of Planning & Community Development

Senior Planner

Heyer Gruel & Associates PA