Plumbing repair. Drain valve leaking. Replace drain valve. Discover water piping in wall is leaking. Cut hole in wall where janitors tub is in back room. Repair leak on air chamber hot side to janitors tub. Found water leak behind cabinets. Take cabinet off wall, cut hole repair cold water line feed to water heater. Turn water on pull mixing valve under Lav to get hot water to sink. Things I would do in fall to shut this building down to stop damage. 1- replace batteries in thermostat and set to 45* to keep above freezing. Shut breaker off in breaker panel to water heater #14 and 16 240 volt breaker right side of panel. 2- turn water off under sink and open drain valve. 3- flush toilet and install RV antifreeze in bowl and part of tank. 5- remove supply from stop on toilet. 6- remove supplies from hot side on both sinks. Return in spring and reverse to turn back on water.