WBBM-TV, virtual channel
Virtual channel
In telecommunications, a logical channel number , also known as virtual channel, is a channel designation which differs from that of the actual radio channel on which the signal travels....

 2 (digital channel 12), is the CBS
CBS Broadcasting Inc. is a major US commercial broadcasting television network, which started as a radio network. The name is derived from the initials of the network's former name, Columbia Broadcasting System. The network is sometimes referred to as the "Eye Network" in reference to the shape of...

 owned-and-operated television station
Television station
A television station is a business, organisation or other such as an amateur television operator that transmits content over terrestrial television. A television transmission can be by analog television signals or, more recently, by digital television. Broadcast television systems standards are...

 in Chicago, Illinois. WBBM-TV's main studios and offices are located in The Loop
Chicago Loop
The Loop or Chicago Loop is one of 77 officially designated Chicago community areas located in the City of Chicago, Illinois. It is the historic commercial center of downtown Chicago...

 section of Chicago, as part of the development at Block 37
108 North State Street
108 North State Street is a site currently under development as an urban center located in the Loop community area of downtown Chicago, Illinois, United States. The 3 building structure is being developed by Joseph Freed and Associates LLC, as a project inherited from the Mills Corporation. Retail...

, and its transmitter is atop the Willis Tower.
WBBM-TV traces its history to 1940 when Balaban and Katz
Balaban and Katz
The first incarnation of the Balaban and Katz Theatre corporation appeared in 1916 in Chicago by A. J. Balaban, Barney Balaban, Sam Katz, and Morris Katz. It held its first meeting as a Delaware corporation on January 21, 1925. Famous Players-Lasky Corporation bought a controlling interest in...

, a subsidiary of Paramount Pictures
Paramount Pictures
Paramount Pictures Corporation is an American film production and distribution company, located at 5555 Melrose Avenue in Hollywood. Founded in 1912 and currently owned by media conglomerate Viacom, it is America's oldest existing film studio; it is also the last major film studio still...

, opened experimental station W9XBK, the first all-electronic television facility in Chicago.