SAN DIEGO (AP) — One of San Diego's most prominent real estate developers has agreed to buy the city's dominant newspaper.

Doug Manchester said Thursday that he would buy The San Diego Union-Tribune for an undisclosed sum. The transaction is expected to close Dec. 15.

The seller is Platinum Equity, a Beverly Hills-based investment firm that bought the 143-year-old newspaper in May 2009.

Manchester has hired media executive John Lynch. The Union-Tribune reports that Lynch has a long history of owning radio stations.

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