He has stipulated however, that the buyer be responsible for it's removal but is willing to part with it for less than $10,000.
That's very generous of him.
We get calls weekly with all of the banks closing branches, and new owner acquiring the properties. They need the doors or entire vaults removed, but none of them want to pay the tens of thousands of dollars (or more) often needed to remove them. There are lots of these doors out there for free if you want to pay to remove them.
I'll let you in on a secret though. It's still cheaper to buy one from a vault company who has one sitting in their warehouse. Not only that, but you'll know that it works, and all of the parts are there.
These big vault doors are not much different than the big highly rated safes. Everybody "wants" one, but few people "need" them. They are expensive, because of what they are designed to do, and the amount of work required to remove, restore, and install them.
I just got the bill for some machine work I had done to replace some parts on a door that I'm currently restoring (I'll post some pics in the future). You can't just go down to Walmart and buy parts for these 100 year old antiques. The bill was just shy of $6,000.
I've seen these doors installed improperly in homes. Heck, it can't be that hard can it? These doors have sank and/or shifted causing serious structural problems. I've even seen a door come free from the wall.
These things aren't toys. They aren't cheap. They are not forgiving. Anybody who's gotten one for free, that works perfectly, was installed by their contractor and is still working, and who hasn't been locked out of it is simply very lucky.