Bill Ayers and Barack Obama shared an office. Ayers’ Small Schools Workshop, the one Obama directed all that money to is located at 115 S. Sangamon Street, Chicago, Illinois 60607 [Note the link is to a year 2000 version of their website]. Here’s a screen grab from the website’s footer:

In 1998, the address for the Chicago Annenberg Challenge, where Obama presumably worked, was 115 S. Sangamon Street, Chicago, Illinois 60607. Here’s a copy of their 1998 tax return with that address:

