Somehow I didn't see Bill's post till I did my own.
2nd get any existing drawings from whoever runs the building projects. Big districts have staff architects leading departments. Small ones might use the head of maintenance.
3rd talk to someone that really knows construction and reading those plans. That should get you the answers to Jon & Bill's questions and maybe raise more.
4th document (take pictures) of anything in the theater that might show more than the surface; edges of floor pockets, transitions between flooring types,
apron edge, even deep scratches...
5th get
clear statements from the 'powers that be' of future plans. More shows, different shows, nontheater groups?
Then you'll understand the issues and the adults will/should listen.
Of course ask questions here as you go along. We have teachers, builders, and many others besides
stage technicians.