After 10 years of living in African refugee camps and two years in a one-bedroom apartment, Baja Dalla and his family soon will have a house they can call their own. Next March, Mr. Dalla, his wife, Nyanchi, and three small children will move to one of the first Leadership in Energy and Environmental Design-certified Habitat for Humanity homes in the world on East 19th Street in the Jefferson Heights area, Jeff Cannon with GreenSpaces said at a news conference Monday.