Not many lenders are doing financing for "non-warrantable" condos any more. Non-warrantable means that the building or development does not meet Fannie Mae or Freddie Mac's guidelines, most likely due to not having yet met % pre-sale requirements or having a high investor concentration. For these reasons, FHA would not approve a mortgage either.
Further complicating the situation is that the PMI companies won't insure these properties either so even if lenders would lend you would need at minimum a 20% down payment.
Is the developer/builder still selling units in the building? If so then I would think they'd have a relationship with a bank who lends to prospective buyers. If not, then like Paul said, check with several local banks. I wouldnt waste your time with credit unions. They normally don't hold any of their paper and usually have stricter guidelines.
Best of luck
I am going through the same problem in St. Joseph.
What we have found is a local bank that will keep the loan in house, (called portfolio loans) and knows the development.
That type of loan is easier to obtain for other than cookie cutter curcumstances.
So, try the local banks that are pre dominant in your area.
If you need FHA, see if the builder is planning on getting FHA approved or if the sub is more than 90% complete.