Habitat for Humanity-North Shore’s project to develop eight affordable condominium units at a previously idle downtown site is officially done. The nonprofit and city officials Sunday dedicate the condominium’s final four units and celebrate the overall completion of the $1.5 million project. The event, open to all, will be held at 1:30 p.m. at the Park Street site. When Habitat began its work, three foreclosed apartment buildings sat on the property. The project involved demolishing one of the buildings and replacing it with two duplex town houses, and converting the other two buildings to duplexes. As of early spring, one of the new town houses and one of the renovated duplexes was completed and occupied. The other new town house and renovated duplex are now finished and occupied, according to Donald Preston, president of Habitat for Humanity-North Shore. Preston said that as with other Habitat projects, the Peabody project was built mostly with volunteers. “It’s an effort by a very large community to make these things happen,” Preston said, expressing his organization’s thanks to all who lent a hand.