Kohn Pedersen Fox (KPF) shared a few images of their newly complete Tour FIRST tower in Paris, France, now the city’s tallest building. Standing 760 feet tall in the city’s LaÂ DÃ©fense district, the glass tower isn’t completely new. It’s actually a major addition on top of a 1970s structure designed by Pierre Dufauâ€”a move the firm said makes the building more sustainable than new construction. New windows were punctured in the old structure’s concrete skin and the building was opened up to surrounding public space. With Tour FIRST, New York-based KPF continues its skyscraper spree, having designed what are currently the tallest buildings in Hong Kong and London.