The Zoning Board of Appeal today approved plans by Brian and Jason Chavez to add a third floor to what is now a two-family house at 567 Adams St., between Lydon Way and Mallett Street in Dorchester and to build a rear extension with five townhouse units.
One of the condos would be sold as affordable, to a family making no more than 80% of the Boston area median income, their attorney, Mike Ross, told the board.
The units in what is now a house on the property would have three bedrooms each; the townhouse units would have two bedrooms each…