Install tankless water heaters
In many commercial buildings, hot water is needed in a few locations, widely distributed around the building. Maybe your water heater is located near your kitchen, but far from your washrooms. Getting hot water to those washrooms either requires a water circulation pump, or running the water for a long time. Either way, you waste energy, and maybe water.
Install a tankless heater near where the water is used. If the savings in water and energy will be great, you can consider an electric tankless heater. But remember we pay 3-5 times as much for electricity as we do for gas (and electricity is 3-5 times dirtier than gas), so only install an electric water heater if your energy savings will more than compensate for this difference.