A Medford nonprofit, Concern for Independent Living, will be given a $3 million interest-free advance to buy and rehab six houses, said the U.S. Department of Housing and Urban Development.

The group helps low-income people recovering from psychiatric illnesses and other disabilities and their families also by providing job support and other services aimed at independence. Each of the six houses will have two residents.

Under the terms of the capital advance, the nonprofit won't have to pay back HUD if the homes are used by very low-income residents for at least 40 years. Very-low income is defined as someone getting less than 50 percent of the area median income, or less than $26,000 for a one-person household on Long Island and less than $37,125 for a family of four.

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Also, HUD will funnel a $293,700 rental subsidy to the group over the next three years. The funds would go toward making up for the difference between residents' rent contribution and the HUD-approved cost of operating the program.

The grants were part of $550 million that HUD announced July 12 for programs geared toward very low-income elderly and people with disabilities. Groups in New York state got almost $52 million.