CHICAGO-Sam Zell's firm has purchased the Elysian Hotel, a 188-room hotel in the Gold Coast, with plans to transform it into a Waldorf Astoria.

LONDON-Quintain has exchanged contracts to sell the Plaza Hotel, a 306-room hotel in Wembley, to Sojourn Hotel Group for GBP 15 million.

NEW YORK CITY-East Greenville, Pennsylvania-based Knoll Inc. has inked a temporary lease deal for 17,000 square feet of space at 766 Sixth Ave. situated between West 25th and West 26th streets.

BUFFALO, NY-A leading local auto dealership has purchased a warehouse and enclosing property in Lancaster.

WASHINGTON, DC-The Washington Post reported that Insight Property Group LLC, an apartment developer based in McLean, has paid $10 million for a grocery store on H Street.

BOSTON-A privately owned firm based in Chicago has paid $55 million for Oak Point, a manufactured seniors home community at 200 Oak Point Dr. in Middleborough, Massachusetts.

SACRAMENTO-A seven-story office building, located on the north side of Sacramento City Hall, has reached the market with an offer price of $15 million.

SEATTLE-The commercial airplanes division of Boeing has signed a lease for 45,000 square feet of space at the Russell Investments Center, an 890,000-square-foot tower in downtown Seattle.