Recommend decking for Chicago rooftop deck
We just bought our first place and it has a 1000 sqf 6th floor private rooftop deck. The pressure treated pine deck that is up there now (11 years old) is in pretty bad shape - the 2x4 stringers directly below the 2x6s are badly rotted and the deck board are dried out, popping up, snapping in half, etc. I seem to put my foot through another board every day.
Long story short, we need a new deck and I'm not sure which way to go. As you can see in the pics below, ventilation is really poor for the deck - the walls are solid on each of the 3 sides and a bedroom takes up the 4th wall. Since it's a condo of course I can't mess with the structure that much.