The House Has Gone Bust!

The House Has Gone Bust! is a side quest that is automatically failed after killing Mr. House because it is not possible to leave to complete it.

Walkthrough
This quest appears after killing or disconnecting Mr. House in the control room. Before this quest is completed (or failed), it will be impossible to take the elevator to another floor from the penthouse. This is due to Victor being hostile. After starting this quest it will usually be immediately marked as failed. In rare cases, the quest will be marked as completed, granting 505 XP, or even 755.