How much does it cost to build a hospital?

It depends upon the size of the hospital. A 1,250 bed regional hospital (with trauma units, CCU, ICU, Neurocare Units, Rehab Unit, 40 surgical suites and helipad) would cost much more than a 35 bed small town hospital, for instance.
To many variables to answer with any sort of accuracy, but around and between $150.00 to 275.00 per square foot.