This is a conceptual proposal by Brandywine Reality Trust. The location, size, and design of each building is subject to change, but generally should follow what you see. Some of the buildings are already being built. Over a decade ago, Brandywine made a similar proposal in West Philly for three skyscrapers. It took about a decade for all three to come to fruition, but they are Circa Centre, FMC, and Evo. If you look at the original proposal, the height and general design for all three is not much different than what was built. This website has all the proposed/being built highrises in Philadelphia with news, and picture updates, including the proposal and individual buildings from the project you are talking about.