In her much-anticipated second book, Victoria Hagan features an exquisite selection of new interiors that embody the "soft modern" look that distinguishes her work. A major force in the design community, Hagan is the master of juxtaposing old and new, showing luxury through simplicity, and creating homes that reflect their owners' lives.

In these appealing, timeless projects--including a New York penthouse, a Nantucket beach house, and a Western ranch--formal architecture is...