APS, alternate power source. 100,000,000 mAH UPS grid tied, then generator ATS, auto transfer switch, rated for 100kW, because you have to install a Generac whole site powerplant. That way, you can charge the other tenants when the grid dies. If you want to be reeeaaal sure, get 1,000,000,000,000 mFarad capacitor bank to absorb lightning strikes, and reuse as Storm Power™.