building at 45 East 89th Street

Very recently, I have been having problems getting a mortgage loan to finance a potential purchase to one of the units of this building. According to multiple mortgage officers, the problem is not with my personal finances, but is due to the underfunding of the "Fidelity Bond Insurance reserve fund" of this building. As this underfunding does not fulfil the current Fannie/Freddie guidelines, banks are not willing to lend as they will not be able to sell / repackage this loan down the road. Which means that unless it's a 100% cash funded purchase, it's almost impossible to get any transactions done to any units of this building. Anyone has any color / solution to this issue? Many thanks in advance...