KPIX CBS 5 and KCBS-AM All News 740 plan to move their South Bay operations from North First Street into the ground floor of what is now known as the Knight Ridder building at 50 W. San Fernando in downtown San Jose, according to a report in this morning’s Mercury News. With the pending sale of Knight Ridder to McClatchy, it is expected that KR will vacate the two floors it occupies in upper part of the 17-story building and remove its exterior signs. KPIX and KCBS will take over the 3,500-square-foot ground floor space once used by KRON for its South Bay Bureau in the 1980s and 1990s. The Merc story this morning didn’t mention it, but 50 W. San Fernando is where Charles David “Doc” Herrold operated KQW, the world’s first radio station to operate on a regular basis. (Other stations went on the air before KQW, but none broadcast regularly.) KQW later moved to San Francisco and became KCBS-AM. CBS 5 reporters Thuy Vu, Tony Russomanno and Len Ramirez will work in the new office when it opens in May along with KCBS reporters Matt Bigler and Mike Colgan.