Condos have become even more of a strange bird in the lending world. One of the most important things I attempt to do in working with buyers is to have them work with a lender that I KNOW can deal with a condominium product. Many of the large institutional lenders don't do enough of these type of loans, and have no programs for these purchases. These big banks tell the buyer, yes, we can do this loan no problem, then they start getting into the process ,i.e. they need a "Type A" letter completed from the building, then realize that there are too many of one owner in the builder, or too many units used as rental properties, or the project is not "substantially" complete, (that is super subjective) etc. The lender then says to that borrower, so sorry we can't make a loan to that particular property. I've had large lenders drop that bomb to the buyer as recent as days prior to settlement.

Fannie Mae has just instituted even more stricter guidelines regarding their underwriting procedures on condos. The "street interest rate" they quote, is never applicable for condos. They require a minimum of 25% down in some circumstances, require a minimum credit score for the borrower, and add 3/4 of a pre-paid point to the rate.

I have found that most of my loans are made by local banks in my area, with experienced underwriters who can explain everything up front to a buyer. 

I can still get a purchaser a 90% loan on a condo. Having said that, I believe it's because I work very closely with a few lenders that really understand how to make that work.

Good luck.