Over the past two decades, Allentown, PA has been steadily recovering from an economic slowdown that began in the 1980s. Today, one of the most visible signs of Allentown's revitalization is the City Center Lehigh Valley development. Encompassing a million square feet, with the new PPL Center arena at its core, City Center includes three Class A office towers, the Marriott Renaissance Allentown Hotel, upscale restaurant and retail facilities, loft-style office space and a co-working space called Velocity