Looking Glass Networks

Looking Glass Networks, Inc. is an U.S. telecommunications company headquartered in Oak Brook, Illinois. The company provides rapid delivery of data transport services including SONET/SDH, Wavelength-division multiplexing and Ethernet as well as connectivity, dark fiber and carrier-neutral colocation. Looking Glass also offers custom design and build services for specific campus or data center requirements. On August 3, 2006, Level 3 Communications acquired Looking Glass, at which time the company's dark fiber offerings were deemphasized in favor of managed lit services.

Services are available in the largest U.S. metro areas including:

The company's physically diverse networks provide customers with connections to primary carrier hotels, incumbent local exchange carrier central offices, key enterprise buildings and other major data aggregation facilities. Looking Glass interconnects with more than 140 carriers, has over 760 points of presence, 430 on-net buildings and 860 Type II buildings. This connectivity, coupled with their protocol "agnostic" platform, allows Looking Glass to deliver flexible service options and fast delivery intervals to customers with significant bandwidth needs.

...
Wikipedia