C3 423 presents several contemporary developments in architectural practice."Parking for good: the public garages gradually turning cities green" shows projects that are innovative examples of how towns can accommodate cars with Antwerp’s new sustainable Park + Ride and the world’s largest bicycle parking in Utrecht. "Small Additions: the interface between now and then", about building extensions that play a role in emphasizing the value and presence of an existing building while responding to the need for additional space. With Robert Koch High School by SSP Rüthnick Architekten and Biot Municipal Building Extension by Atelier EGR. "Sport Halls and Spirituality", shows projects by :mlzd and Nikken Sekkei."Living with Trees in the Sky" looks at three recent examples that are a radical departure from the hard and inert look of normal high-rise architecture which exposes concrete, steel and glass. The first generation of high-rise residential buildings in which vegetation is designed into all levels is emerging. Projects by MVRDV and the first visibly green towers in a Taiwanese city by WOHA.