The 5,978-square-foot house, with five bedrooms and five bathrooms, was the first one she built herself -- planning and seeing the project through to completion.
"The shutters were in centimeters," said Gallagher, who had to convert them to inches to make sure they fit. "It wasn't easy, but it worked out beautifully."
The house, built in 2003, has a floating staircase, a turret, a wine cellar and a home theater. A guest suite has its own entrance. Outdoors, there's a kitchen with a pizza oven and a playhouse built to look like the main house.
One of Gallagher's favorite things about the property is the olive trees, which were moved from Northern California; they had been slated to be sold for kindling. "They're 45 years old now," she said, "and I feel they give the house a lot of character."
The former top model appeared on more than 20 Vogue covers worldwide. She has built eight houses locally in the last six years.
Listing agents are Anthony Marguleas of Amalfi Estates, Pacific Palisades, and Steve Frankel, Coldwell Banker, Beverly Hills East.