Founded by the architects Marc Kushner and Matthias Hollwich in 2007, Hollwich Kushner (previously HWKN) is known for making adaptive reuse sexy. Its highest-profile 2016 project, the Pennovation Center, an incubator at the University of Pennsylvania in Philadelphia, was originally a concrete-frame factory. But unlike many adaptive reuse projects that end up obscuring the original building with their emphasis on shiny newness, the Pennovation Center tastefully preserves the structure’s flaws, to great effect. It’s an example of adaptive reuse done right in a space meant to encourage innovation and forward thinking—a hallmark for Kushner and Hollwich, who double as tech entrepreneurs. They also cofounded the architecture website Architizer.com, which has become a must-read in the industry.