I need an office mailing address for Bill Curtis,(of A&E's
Investigative Reports,)Bill Curtis Productions or maybe Curtis
Productions or whatever his production company's name is.

Here is the information you need, from two reference sources:

"Kurtis Productions 
 400 W. Erie, #500 
 312/951-5700 
Founded in 1990 after Bill Kurtis left his position as a 'CBS Morning
News' anchor, Kurtis Productions makes investigative documentary and
one-off long-form reports for PBS ('The New Explorers,') A&E
('Investigative Reports,' 'Cold Case Files'), the History Channel, the
Biography Channel, and other cable outlets."

Reel Chicago: A Survey of Local Docmakers
http://www.reelchicago.com/archive.cfm?storyID=476

"KURTIS PRODUCTIONS, LTD.
 400 West Erie/Suite 500 Chicago IL 60610
 312/951-5700 FAX 312/951-8251
 Specializing in documentary production.
 Bill Kurtis - President"

Creative Directory: Film & Video Producers
http://www.creativedir.com/html/52.html

My Google search strategy:

Google Web Search: "kurtis productions" chicago
://www.google.com/search?hl=en&q=%22kurtis+productions%22+chicago

I hope this is helpful. If anything is unclear or incomplete, please
request clarification; I'll be glad to offer further assistance before
you rate my answer.

Best regards,
pinkfreud

Thank you very much for the five stars and the nice tip!

~pinkfreud