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Thereof, where is the water shut off for shower?
This supply valve is usually near the bottom left side of the toilet tank. For showers/tubs, look around the tub or shower for an access panel. It may be on the other side of the wall from the tub or shower.
Consequently, how do I turn the water off to my building?
Just turn off the water supply to your building at the main water shutoff valve. You can usually find this valve on the water pipe just inside the building where piping enters the structure.
This valve is usually in the basement or on an outside wall in a utility area of the house. The main shutoff valve allows a full flow of water through the pipe when it's open. Turning off this valve (by turning it clockwise) cuts off the water supply to the entire house.