IMHO, you might want to call the building department to see what the restrictions and permits are for this project. Also I ma sure you will need ARC approval for this project. The lanai floor is definitely slopped, ours is 2 inches over 13 feet, so you need to consider this for furniture. The ceiling of the lanai are typically not insulated, and the existing A/C is typically not rated for the additional cooling (or heat) load. Not sure of the implications of NOT raising the floor. You will need to meet current building codes, doors, windows, electrical receptacles, etc. If you plan on leaving windows open, plan for a wet floor and make sure you have a flooring for WET locations installed.
Hope your project goes well.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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