An infusion of modern fixtures and furnishings will banish stuffiness from any traditional space. Consider this family hangout, where a doodle-ready chalkboard—the starting point for the design—is set alongside flat-panel wainscoting with a coffered ceiling overhead. The trestle table reflects the 1904 home's Craftsman aesthetic, while curvy Danish pendant lights and Hans Wegner chairs play off the classic millwork. "We love modern, beautifully designed things, and we also love old buildings," says homeowner and designer Kim Clements, creative director of Seattle-based J.A.S. Design Build. "It's all about authenticity and function." The chairs are comfortable; the lights cast a warm, glare-free glow. And there's always room for one more at the table. Like to create a similar mix? Read on.