I am a Mortgage Broker in Florida. I can help with finding a rep in any other state.
I have attached my Trulia article below.
It's not always possible, but one of the best ways to finance investment condos such as the one you describe is to have the buyers refinance a primary home and get funds to buy the new place in cash. There are a number of advantages to this approach:
1) Ease of transaction.
2) Better rate for the buyer/borrower.
3) Tax advantages pertaining to mortgage interest.
Again, sometimes this is not an option, but always look for it. Financing non-warrantable condos is VERY tough these days.
Let me know if I can be of service.