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Benson sold the hotel to William Boyd and Robert Keller in 1919. They, in turn, sold it to Seattle-based Western Hotels in 1944. In 1959, the old Oregon Hotel building next door was demolished by Western to make way for a 175-room annex to the 1912 building. Western International Hotels was renamed Westin Hotels in 1981, and the hotel became The Westin Benson. The Westin Benson was added to the National Register of Historic Places in 1986. Westin Hotels sold the hotel to WestCoast Hotels (now Coast Hotels &amp; Resorts) in 1988 and it returned to its original name.