user: Question: When did the hotel with 727 rooms open?
Columns: ['Casino', 'Opening Date', 'Theme', 'Hotel Rooms', 'Section of Atlantic City']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Atlantic Club', 'December 12, 1980', 'Beach Resort', 809.0, 'Downbeach']
SQL:

assistant: SELECT "Opening Date" FROM "Table" WHERE "Hotel Rooms" = 727.0;