What’s required for a rooftop deck?

[Igor Messano]

Hey folks,

I have a mixed use property that has two store fronts (1 story) and 4 apartments behind it (3 stories). The 2nd floor is entirely 1 apartment and the front window looks directly onto the roof of the commercial spaces. When I was doing some work up there I noticed that there were some old railings on the side and on top of the window along almost the entire width of the building is an old awning system. Seems like this rooftop was used as a deck in the past.

Does anyone know if it would be very difficult to put that deck back on as far as permitting etc goes? Construction it’s self is relatively straight forward as this would be a floating deck on top of the waterproof membrane. The window also looks like it was converted from a doorway to a window so turning that back should be simple.