He built his reputation through striking, unconventional urban monuments like the Guggenheim in Bilbao and LA’s Walt Disney Concert Hall. But for his latest project, Frank Gehry looked a little closer to home.

The world-renowned architect, who turned 90 last month, has been overseeing the design of a new Santa Monica residence for him and his wife, Berta. In an Architectural Digest exclusive, Gehry discussed the rare opportunity to work on a small-scale building, calling the result “a once-in-a-lifetime house.”

The structure’s exterior is, in many ways, typical of the Pritzker Prize-winner’s oeuvre. Glass planes and gabled roofs shoot off at a variety of angles, giving the house a dynamic, sculptural quality. But the design was in fact led by his son, Sam, who works as an architectural designer at his father’s firm.