Charlestown’s Constitution Inn is set to become affordable housing after the Boston Planning & Development Agency approved the redevelopment project at its December meeting. 

In September, the Archdiocese of Boston and St. Francis House filed a letter of intent with the BPDA expressing their desire to convert the property at 150 Third Ave. in the Charlestown Navy Yard. The site is owned by the BPDA and leased by the YMCA of Greater Boston, which uses the building as a fitness center. 

The project will convert and renovate the building’s 147 hotel rooms into 100 income-restricted residential units. They will be a mix of studios, one-bedroom and two-bedroom units. 

Forty-eight of the 100 units will be dedicated to the city’s Permanent Supportive Housing (PSH) model. They will be units that include “on-site services for vulnerable populations that support stable tenancies,” according to the BPDA.  

“The PSH model combines providing deeply affordable, permanent, leased housing for individuals experiencing homelessness with tailored individualized services to assist people with disabilities to live successfully in the community long term.”

The YMCA will lease back the remaining space in the building, which will be renovated so the organization can continue to operate a fitness and wellness center at the property. 

Located close to public transportation, the project will also provide a dedicated shuttle for residents. 

The building’s ground-floor space will be community serving. Project developers plan to work with community partners and community-based organizations to program the project’s community room and computer space with programs and services available for area residents.