Window sill height on second floor by code?

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Hi, I am renovating a unit in the city of Pittsburgh and I need to know how low the window sills can be on the upper level.  

I am foregoing putting a balcony to save costs, but still would like a lot of the wall to be windows.  

Do I need to put one of those Juliet balconies if I want a window that is lower to the floor on an upper level?  

Thanks, 

-Frinee