Others have mentioned this already but there are plenty of regulations that are relevant just for hospitals because of what they are. For example, the bulk of the historic LA county hospital is vacant, because the building is no longer up to the seismic standards required by the state for a hospital. When you have a big earthquake, you probably want the hospital to be the very last building to fall in the city. The building, however, is used for things like offices or storage because these uses don't have the same standards as a hospital.