ATLANTIC CITY — The Trump Plaza Casino and Hotel is now closed, its windows clouded over by sea salt. Only a faint outline of the gold. Trump Plaza is a closed hotel and casino on the Boardwalk in Atlantic City, New Jersey, owned by Trump Entertainment Resorts. Designed by architect Martin Closing date : September 16. ATLANTIC CITY — Since , Trump Plaza has been a fixture on the resort's historic Boardwalk, but that could soon be changing.