Male Born 1981 Searching For Birthmother

Hey Everyone, Well, I'm new to these boards and am really interested in locating my birthmother. I was born in '81 at Skokie Valley Community Hospital (not sure what its called now) and was adopted by my family a few weeks later. My adoptive mother passed away from cancer when I was 3 and was raised by my adoptive father, my Nana, an au-pair and finally by my step-mother. I have pretty much everything needed to locate my birthmother (certificate of adoption, her name and old home address, letters from the lawyer that assisted in my adoption, and other various paperwork.) But everytime I try to locate her, I hit brick walls. I couldn't have asked for a better adoptive father. He's been there to teach me things, lead me in life, and is truely my role model. I don't know whether or not I will want an on-going relationship with my birthfamily, but at least being able to find them will give me the closure that I need in my life. Any help that you can throw my way to try and get that closure is absolutely appreciated. Thanks in advance and I look forward to reading any responses! ~Chris