Do you happen to know WHEN your Grandpa Schulz lived in Chicago? My grandmother came to the US in 1926 and she was sent the money for her cabin by a "cousin" Rudolph Bos in Chicago. She lived in Chicago for a few years and then returned to New York City. All I have been able to find is an entry in a city directory with his address. If you go to the Chicago Public library, there is an "Ask the Librarian" and you can ask a single reference question---they will look it up for you. Perhaps they would be able to locate your Grandpa's first name, or give you a list of Schulz's that lived in Chicago.