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Months after her death, Diane Keaton’s “Pinterest” house in Los Angeles’s Sullivan Canyon sold for $18 million this month.

The sprawling estate, with more than 9,000 square feet of living space, was a passion project for the actress, who appeared in some 100 movie and television roles. Ms. Keaton spent decades renovating the home, a process that was detailed in her 2017 book, “The House that Pinterest Built.”

“Once upon a time, scrap bookers, collage artists, image-driven addicts and appropriators like me were lonely hunters,” Ms. Keaton wrote in the book’s introduction. “Now dare I say billions of people discover, seize and enlarge their reference pool with the variety of beauty allocated from others.”

The property, one of the few that she owned but did not sell, features five bedrooms, eight bathrooms, brick walls, cathedral-vaulted ceilings, and a “collection of reclaimed light fixtures,” according to the listing. Outdoors, there’s a separate guesthouse, an in-ground heated pool and a spa.