After you get halfway through the side-quest for Kurt you can talk to Jaffar to flag this one - which starts with the radio picking up an automated distress message from Hanson, the leader of an off-shoot group of survivors.
Some sort of accident has happened and the broadcast claims they need help but nobody actually alive can be reached and Brecken therefore refuses to risk any runners to check it out.
You decide to check it out for yourself!
When you arrive at the building you discover that outside there are a LOT of infected - and the entire building is ringed in electrical traps. You will need to at a minimum take out the Toads and perhaps some of the regular infected before you can safely turn off the generator.
Once it is off you discover Hanson - who it seems has been killed by the biters. Head to the second generator and shut that off, then head to the third one and turn IT off,. At that point you can now investigate the area - which means climb up the building.
Once you make it to the roof you discover that pretty much everyone is dead - and you find the radio recorder and learn the whole story. They drank the cool aid man! But on the plus side, there is a Pair of Binoculars here! Be sure to grab those for the other quest.
Head back to Jaffar and talk to him to collect your reward.
Collectibles
Note #24 - on top of the roof.
Note #25 = on top of the roof.