Long-time clients who are “empty nesters” downsized from a larger house to this new condominium, designed to showcase their small yet impressive collection of modern art. The space plan, high ceilings, and careful consideration of materials lends their residence a quiet air of sophistication without pretension. Existing furnishings, nearly 30 years old, were slightly modified and reupholstered to work in the new residence, which proved both economical and comforting