A fund led by a South Korean unit of China’s Anbang Life Insurance Co. Ltd. has bought a prime office building in Seoul for 240 billion won ($225 million) from New York-based investment firm Angelo, Gordon & Co. Tongyang Life Insurance Co. Ltd., 75% owned by Anbang Life, committed an undisclosed amount to the fund, run by South Korea’s ANDA Asset Management Co. Ltd., as the largest investor in the acquisition deal closed on Dec. 27.