Developed by Brandywine Realty Trust and designed (mostly) by Pelli Clarke Pelli, none of the three can claim to be the tallest in Philadelphia, a title that will go to Norman Foster's 1,121-foot Comcast tower when it opens sometime next year. None are particularly groundbreaking as architecture, either, although the designs are all skillful. But collectively, the trio is powerfully transformative. Together, they shift Philadelphia's business district from Center City to the university area. Their presence is the clearest evidence yet that the city has cast its future with the new research-driven economy of meds, eds, and tech.