Contact me off linet at Gail@GailGladstone.com and I will refer you to a terrific mortgage broker who is focusing on foreign national lending.
I'm with Douglas Ellimand and we have our own mortgage company, if you like I can get you a couple of #'s to our mortgage brokers who deal with probaby 30 different lenders on regular bases and they can further advice you on what is required.
Let me know,
The loan to value for foreign nationals is more in the range of 35-40% or 60/65 LTV.
There may be private lenders that would be willing to stretch the LTV at higher than standard rates.