Iris Cantor has sold her Bel-Air estate for $40 million. (Nick Springett)

La Belle Vie, the mammoth Bel-Air residence built in 1993 for philanthropist Iris Cantor by her husband, Bernard Gerald Cantor, has sold for $40 million, public records show. The sale is one of the highest this year in Los Angeles County.

The mansion had been marketed at $53 million since 2009. It was designed to house the Cantors' extensive art collections.

The 35,000 square feet of living space include a three-story entry hall, a formal library, a media room, a gym, a billiards room, a beauty salon, three kitchens, 12 fireplaces, nine bedrooms, 21 bathrooms and a staff wing. The property includes a pool, a tennis court and a 10-car garage.

Iris Cantor is chairwoman and president of the Iris and B. Gerald Cantor Foundation, which supports the visual arts and medical, educational and cultural institutions. B. Gerald Cantor, who died in 1996 at 79, cofounded the securities firm Cantor Fitzgerald.

Ron de Salvo of Coldwell Banker, Beverly Hills, was the listing agent, according to the Multiple Listing Service.

A different shade of green

Singer-songwriter Avril Lavigne, who has been sporting emerald highlights in her hair, may soon see another kind of green. She has listed her home in a gated Bel-Air community for $9.5 million.

The Mediterranean-style house, built in 2003, has a two-story foyer, a wine cellar and tasting room, a gym, eight bedrooms and 101/2 bathrooms within its 12,184 square feet. The master bedroom suite includes a kitchenette, a fireplace, a patio, walk-in closets and dual bathrooms. The garage can park 10 cars. Among outdoor amenities are an open-air kitchen-barbecue area, a swimming pool and a spa.

Lavigne, 26, has been touring to promote her latest studio album, "Goodbye Lullaby," which was released earlier this year, and is working on her fifth album. Her debut album, "Let Go," was released in 2002.

The pop star and her then-husband, Sum 41 singer and guitarist Deryck Whibley, bought the house in 2007 for its current asking price.

Jade Mills and Zach Quittman of Coldwell Banker, Beverly Hills South, are the listing agents.

Comic tests his timing in Malibu

Comic and actor Cheech Marin has listed a home in Malibu at $5,995,000.

The 1929 Craftsman-style house sits on nearly an acre on a low bluff above 120 feet of beach frontage. The three-bedroom main house includes a master suite with stained-glass windows. A three-bedroom guesthouse has a gym and a detached music room.

Since he partnered with Tommy Chong in the '70s and '80s counterculture comedy duo Cheech & Chong, the 64-year-old Marin has starred on "Nash Bridges" (1996-2001) and was a regular on "Judging Amy" (2004-05).

The listing agents are Irene Dazzan-Palmer and Sandro Dazzan of Coldwell Banker, Malibu Colony.