So, after a few playthroughs, I found the optimal order of operations. (Alliteration FTW.) First cut off the power, then proceed to steal the office key and break into the safe, go back downstairs and take as much as you can, it's quite easy to get a good haul before the owner shows up.
 "Hero's Adventure"){kind=icon}
 "The Very Organized Thief"){kind=icon}
 "Freefall Tournament"){kind=icon}
 "Death vs. Monstars"){kind=icon}
 "Treadmillasaurus Rex"){kind=icon}