"KPIX-TV (Channel 5) is the CBS owned and operated television station in San Francisco, California. Through its parent company CBS Corporation, KPIX is co-owned with The CW affiliate KBCW-TV (Channel 44).

Known on the air as CBS 5 Bay Area, KPIX is home to one of the higher rated newscasts among CBS-owned stations. On January 28, 2008, KPIX started to broadcast local news in HD, becoming the third station in the Bay area to do so.

KPIX signed on December 22, 1948 as the nation's 49th television station, as well as the first in northern California. KPIX's first studio was in the attic of the Mark Hopkins (just above the “Top of the Mark.”)"

-Taken from Wikipedia