At least 10% of the units will be dedicated for households earning no more than 60% of the area median income under the terms of a pending development agreement. The purchase agreement, which was entered into on Oct. 28, requires that the State Historic Preservation Office determine the appropriate treatments are in place to avoid and mitigate any adverse effects on the physical features and historic character of Historic Old Central. Historic Old Central opened in 1892 and was modeled after the Allegheny County Courthouse in Pittsburgh. The Richardsonian Romanesque-style school was designed by Emmet S. Palmer and Lucien P. Hall. The building served as a regular high school until 1971 and was placed on the National Register of Historic Places a year later.