<h1><span style="color: rgb(0, 0, 0);">The Haunting of Allegheny Center: Building #7 and the North Side’s Chilly Secrets</span></h1><p><span style="color: rgb(0, 0, 0);">Allegheny Center sits on Pittsburgh’s North Side like a mid-century island: a 1960s redevelopment project built over an older city core, with office towers, apartment blocks, and the remnants of …