I need to build a couple of small offices in a commercial building. From the concrete floor, there is no substantial structure until the concrete bottom of the second floor 18' up. Currently, there is a 10' drop down ceiling. My problem is....what can I attach the top track to? Obviously, there's nothing there but the metal grid work of the ceiling. Is there a way I can stabilize the new walls with some sort of framing above the ceiling? Any suggestions or thoughts are appreciated.