Website: http://www.aads.net/
The only address I've come across is 311 West Washington St, Chicago, IL.
Apprx. Coords- -87.63547 41.88272
It appears that this is Ameritech's NAP in Chicago. They list their customers as the following:
1. Adelphia (OC12c ATM)
2. Akamai Technologies (OC3c ATM)
3. Allegiance Internet (OC12c ATM)
4. Ameritech Corp.(DS3 ATM)
5. Argonne National Laboratory (Univ. of Chicago) (OC12c ATM)*
6. AT&T Canada (OC12c ATM)
7. AT&T Worldnet (OC3c ATM)
8. BBC Internet (OC3c ATM)
9. Bell Nexxia (OC-3c ATM)
10. Beyond The network ( OC-12c ATM )
11. Big Pipe (OC12c ATM)
12. Broadwing (OC12c ATM)
13. BT Global Services (OC-12c ATM)
14. Cogent (OC12c ATM)
15. Comdisco (OC3c ATM)
16. Electric Lightwave (OC3c ATM)
17. EnterAct Corp. ( OC-3c ATM)
18. Epoch Networks (OC3c ATM)
19. Genuity (OC12c ATM)
20. Getronix Gov. Solutions (OC-3c ATM)
21. Global Crossing (OC12c ATM)
22. GT Group (OC3c ATM)
23. Harvey Library (DS3 ATM)
24. HiNet( AT&T Solutions) (OC3c ATM)
25. MCIvBNS (OC12c ATM)
26. MCI Telecom ( 2xDS3)
27. McLeodUSA (OC12c ATM)
28. Motorola (OC3c+DS3 ATM)
29. NetNitco (DS3 ATM)
30. One Call Communications (OC3c ATM)
31. Qwest (OC12c ATM)
32. State of Illinois ISBE ( OC-12c ATM)
33. Time Warner (OC12c ATM)
34. University of Chicago (OC3c ATM)
35. University of Notre Dame ( DS3 ATM)
36. UUNet, An MCI WorldCom Company (OC12c ATM)
37. Verio (OC12C ATM)