In its sustainable development work, the Rotterdam, Netherlands, firm ArchitectenConsort concerns itself not only with energy use and water consumption, but also with the subtler matter of what makes a dwelling or neighborhood last. The durability of materials and details is part of the answer, says senior architect Edgar Bosman, but so are the ways in which people interact with the buildings, the site, and each other. Truly sustainable houses and communities function well enough that people will value and maintain them. “For us, social cohesion is a really important part of the design,” Bosman says. The firm’s new housing development in southern Sweden reflects that philosophy.