FSBO in non-warrantable building?

We're considering selling our condo in the Apex in Harlem, which is above a new Starwood hotel. The hotel is a little under 50% of the building, so there's no way to get a Fannie/Freddie backed loan. That said, nobody has had problems getting loans through one particular broker. How do I handle this situation to minimize confusion and make the process as easy as possible? Ideally, I'd like people to get pre-approved through someone who I KNOW is going to lend in the building before entertaining any offer. I also obviously wouldn't want the listing to linger longer than it needs to because of the red tape, either. Any advice on strategy and how to word in the listing would be greatly appreciated.