If you are fishing for foreclosures - you can subscribe to Realtytrac.com service. It works for some people. There are a couple of boutique real estate firms in Brooklyn I know that specialize in dealing with banks directly in selling Real Estate Owned. They have started in this niche business years before the recent real estate meltdown. If you need more information - feel free to give me a call.
Licensed Real Estate Representative
2548 Coney Island Ave.
Brooklyn, NY 11223
646 256 0899 (Cell.)
You can check local public records, tax records, ask any local agent, etc.; keep in mind that most lenders require the listing be on MLS in order to solicit multiple offers, therefore you may wish to consider working with an agent who can notify you when it is listed; that way the necessary steps can be taken right away....
If it is truly foreclosed that means the ownership has transferred to someone, or to a bank, at the auction. County records will now tell you who bought it. I am not sure why you want to know, but you will need to wait until it is listed for sale to be able to buy it.