Coldwell Banker/Beverly Hills North

Kara DioGuardi is trying to rent out her massive Studio City, Calif., mansion ... for $45,000 a month!

That's what a lot of people make in a year! Yowza.

The 7,600 square-foot home features five bedrooms, six-and-a-half bathrooms, a 20-foot-high chimney/fireplace combo, a grand piano (for singer/songwriter Kara, of course), a sauna, an art studio (Kara's hubby is an artist), fountains, balconies and an infinity pool.

We're guessing Kara's looking to rent because she's so busy! The singer/songwriter and former American Idol judge is currently making her Broadway debut as Roxie Hart in Chicago through October 30.