user: Question: what is the maximum completed for Delta Bessborough
Columns: ['Rank', 'Building', 'Address', 'Height', 'Storeys', 'Completed']
Types: ['real', 'text', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'La Renaissance Apartments', '424 Spadina Crescent E', 'm (ft)', 24.0, 1983.0]
SQL:

assistant: SELECT MAX("Completed") FROM "Table" WHERE "Building" = 'Delta Bessborough';