Turn on power generator in the cellar | Chapter 9 - Militarized Zone DI Riptide Guide

Listen to Hardy and then start searching the insides. I recommend to loot carefully all rooms because you'll find plenty of med-kits and containers with cash and resources. Until the power returns, you have to use your flashlight. When you get to the staircase, go to the cellar.

In the cellar you find among others a workshop. Your objective is to get to a switch (screen above), eliminating a Walker on your way. Use the switch.