Equinix is the most popular with TelX bringing up second place. Both have expensive cross connects. There are others, but they aren't relevant for interconnection.

Intra-building connectivity is damn expensive.

https://peeringdb.com/advanced_search?address1__contains=350&city=Chicago&reftag=fac

-----
Mike Hammett
Intelligent Computing Solutions
http://www.ics-il.com

Midwest-IX
http://www.midwest-ix.com

From: "Jason Lixfeld" <jason+nanog@lixfeld.ca>
To: "NANOG mailing list" <nanog@nanog.org>
Sent: Thursday, November 22, 2018 2:09:08 PM
Subject: 350 E Cermak

Hey all,

Looking for some clue on how things work, and who’s who for colo at 350 E Cermak. Looking at possibly putting a rack in somewhere there for a Peering/Transit/PNI POP. Is there a list somewhere of colo facilities in that building?

Also, how does it work there in terms if inter-colo, intra-building connectivity, or is that a mixed bag?

Thanks!