Sustainability and energy-efficient buildings are hot topics in modern architecture, and one of the latest marvels is the Floating Office in Rotterdam. The building consists of coupled blocks of concrete that float atop the Nieuwe Maas river, and uses its waters for both cooling and heating. In addition, it has smart HVAC technology from Belimo to help create an optimal environment while using minimal energy. Together with the solar cells installed on the roof, this innovative set-up makes the building entirely self-sufficient.