[Grigori O'Limer]

That quest is an awful lot of goose chasing, just to find out you can get this badass PA at the very end... if you double-cross the palooka ghoul who hired you. Still one of the most enjoyable quests for its simplicity. Surprisingly, it crushed me to have to kill Tenpenny, seeing as how I'd been living in his tower since near start-game. (Had high Explosive skills even without Mentats; took quest from Burke immediately; lived in TP towers happily ever after)

Another good quest having to do with the towers is the continuation of that encounter with the ghoul who first loitered out in front of the towers. While helping the ghouls kind of ruins the towers permanently, you do get that awesome Ghoul Mask. Very useful for exploring places where the likes of Glowing Ones and Ferals roam.