When BCBG founder Max Azria and his wife Lubov bought their Holmby Hills home Maison du Soleil in 2005, the $14.5 million estate was already a piece of Los Angeles lore. The 30,000-square-foot “bungalow” in the exclusive Westside neighborhood was one of the classic, sprawling Hollywood estates built in the 1930s by Paul Williams—architect to the stars, including Frank Sinatra and Lucille Ball.

The fashion royals have painstakingly glamorized all 17 bedrooms, 22 bathrooms, and everything else across thei…