The unknown building appears to be a not yet released version of the monster locker. Most likely developed in advance to monsters being made to be unlocked by it.
Objection. File:SigTF1.png I need a Sentry Gun riiiight here. User Talk:DarkusAlpha 04:03, October 2, 2011 (UTC)
It IS a stub, but the problem is that you can't help to expand that page because that it's locked.... Leohuangchunwang 10:45, October 14, 2011 (UTC)
Umm...[]
Umm... I might know that this is still unreleased. It hasn't been released for 1 month. I think this will be released this month or i dunno... (or not...)
Teratorn43906 {Backyard Monsters Wiki} 12:34, October 17, 2011 (UTC)