Rusty A. Payton, Broker
5650 N Broadway
Chicago, Illinois 60660
other issues. The a good architect will take care of the rest.
You need to consult with an architect. They are responsible for signing off on any drwaings required by the city before a permit is issued. The city has strict standards and codes that need to be adhered to which may require work on the structure of the building to support a deck.
Best of luck, Ken.