According to the Small Business Administration, you can do this by opening a business bank account, getting a Data Universal ...

If you don’t lock in right away, a mortgage lender might give you a period of time—such as 30 days—to request a lock, or you might be able to wait until just before closing on the home.

Once you know what type of mortgage you want, finding the right lender may be easier than you expect. Don't want to do the research? A mortgage broker can give you a personalized list of options.