Can "owner occupant only" requirement be enforced?

[Jack M.]

I was looking at listings on Zillow to get a feel for an area, and I saw this one come up:

http://www.zillow.com/homedetails/7801-Saint-Fabia...

Depending on how much work it needs, it may be a great deal (Rents go for 1100-1400 in that area), but I notice this in the description:

"ONLY OWNER OCCUPANTS SINCE THIS IS AN APPROVED NSO SHORT SALE."

If I walk in there with cash, who are they to tell me what I do with the property afterwards? Surely the bank doesn't care what happens to it afterwards. I don't see how they'd have any legal standing to enforce this.

Any thoughts? What am I missing here?