Around the country, public housing authorities are struggling to modernize or even maintain their decades-old properties, leaving tenants in deteriorating and inaccessible buildings. But in Massachusetts, some housing authorities are using — or contemplating using — a unique model to fund expensive redevelopments. By partnering with private real estate companies, they are creating new mixed-income buildings to accommodate low-income public housing tenants as well as higher-income tenants who can pay standard market rents.

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