Simon Cowell has quietly unloaded a Mid-Century Modern estate in Beverly Hills, California.

Mr. Cowell, 60, the tough-love judge on “America’s Got Talent,” never officially listed the four-bedroom home for sale. But transaction details on realtor.com have been updated to say the posh address sold earlier this month for $14.5 million—marking a significant loss for the English TV personality.

He purchased the house, located in the coveted Trousdale Estates neighborhood, for $15.5 million in 2011, according to property records. But the loss is likely much more than an even $1 million, according to Variety, which also factored in multiple renovations under Mr. Cowell’s watch, plus the costs of holding the house for nearly a decade.

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A rep for the star could not immediately be reached for comment, and up-to-date details on the state of the home are scant since Mr. Cowell never formally listed the property.

It was originally designed in the 1960s by Harold Levitt, a local architect who drew up numerous celebrity mansions, including for the likes of Steven Spielberg and Olivia Newton John. Levitt died in 2003 at the age of 81.

The house spanned 7,200 square feet when Mr. Cowell bought it, including four bedrooms and four full bathrooms—though he got permission in 2014 for a multimillion-dollar addition to the property, building records show.

An old listing for the property also boasted a private screening room and gym. A former image shows a secluded outdoor terrace with a glamorous pool area, though that, too, got the green light for remodel five years ago.

Mr. Cowell, a music-industry heavyweight who went on to create TV talent competition “The X Factor” and the “Got Talent” franchise, appears to be lightening his Los Angeles property portfolio. He recently sold a larger Beverly Hills estate for $25 million, The Real Deal reported last month.

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