MassDevelopment has issued a $20 million tax-exempt bond on behalf of Wayne at Columbia LLC to purchase and renovate seven buildings containing 83 affordable housing units in Boston’s Dorchester and Mattapan neighborhoods.

Renovations for Wayne at Columbia will include new kitchens, bathrooms and heating systems, as well as asbestos and lead abatement and installation of a sprinkler system. All 83 units will be rented to households earning no more than 60 percent of the area median income.

In addition to the tax-exempt bond financing, MassDevelopment assisted the Department of Housing and Community Development with the approval of federal low income housing tax credits, which will generate approximately $9.3 million in equity.

The Wayne at Columbia project is part of the overall redevelopment of the Wayne Apartments project, a scattered site development serving 349 lower-income households in Roxbury, Dorchester and Mattapan. Project developer Cruz Development Corp. of Roxbury also developed the Wayne at Franklin Hill community, a major renovation of 72 units of affordable housing that used proceeds from a $9.9 million MassDevelopment bond.