The development features 269 rental apartments and room for 53 single-family homes. About 15 of the homes, ranging in price from $100,000 to $200,000, have been sold.

Five years ago this week, Overlook Park was nothing but the Allentown Housing Authority’s hopes jotted down on paper. It was the site of Hanover Acres and Riverview Terrace, two of the country ...