The first step is to find a local commercial loan broker and/or some local banks that lend on these types of deals. The discussion will likely center around a bridge loan. Your job is to determine the potential and find a lender that agrees.

I have seen banks that will do 80-85% loans based on fixed up values.

Or:

Have you talked to the seller? Can you bail them out of foreclosure and perhaps do a wrap loan with them?

What are the circumstances surrounding this building? More information would be helpful.