In late 2014, 98,000 square feet of the vacant Strawbridge's re-opened as the aforementioned Century 21 discount department store. This was seen as the first stage of the mall's redevelopment.
Graphic from Wikipedia / "TigerK_69"
A rendering of the exterior of FASHION OUTLETS PHILADELPHIA. A 325 million dollar renovation, which commenced in late 2016, is reconfiguring the 1970s-vintage concrete caisson GALLERY structure with large expanses of glass and "Streetscape" stores.
Drawing from www.preit.com (Pennsylvania Real Estate Investment Trust)