Plum Creek Timber Company, Inc. was a timberland owner and manager, as well as a forest products, mineral extraction, and property development company, until it merged with Weyerhaeuser Company. It was headquartered in Suite 3100 at 601 Union Street in Seattle. On November 8, 2015, it was announced that Plum Creek would be bought by Seattle-based Weyerhaeuser for $8.4 billion, forming the largest private owner of timberland in the United States. The transaction closed on February 19, 2016.