Singer/songwriter Kara DioGuardi — who wrote honestly in her book, “A Helluva High Note,” about the difficulties she encountered during her stint as an “American Idol” judge — has listed her three-story townhouse-style condo at the Dillon, 425 W. 53rd St., for $4.79 million.

It was first listed in September 2015 for $5.19 million. DioGuardi has written and collaborated with artists including Britney Spears, Gwen Stefani, Kelly Clarkson and Christina Aguilera.

Her four-bedroom home comes with its own entrance at street level, as well as another entryway via a subterranean parking space. Inside, there are 12-foot ceilings, floor-to-ceiling windows and sliding glass doors that lead to a 695-square-foot private landscaped backyard.

There’s also a large living room, an open chef’s kitchen with a wine refrigerator, a home office/nanny’s suite and central air conditioning.

The master bedroom alone has five south-facing windows, its own home office alcove and a spa-like bathroom.

The listing brokers are Douglas Elliman’s John Gomes, Fredrik Eklund and Hunie Kwon.