Office building broke up but total of 2718 production floor is 19200

We have absolutely no idea what you should charge and since you don't readily know the answer to this question then you really shouldn't bid on a job of this size...;) If you think you could trust an answer from any website I have to say your future in business does not look very promising!! I say this only to be helpful as a good business person learns what to charge through experience, not by looking for shortcuts, OK?

Best of luck to you...

Mark