 Westinghouse Broadcasting (popularly known as Group W), concerned over its top-rated Baltimore station WJZ-TV (channel 13) losing its ABC affiliation to WMAR-TV, reached a deal to affiliate WJZ-TV and its two NBC affiliates (WBZ-TV (channel 4) in Boston and KYW-TV (channel 3) in Philadelphia) with CBS on July 14, 1994, as part of a deal that renewed the network's affiliation agreements with KDKA-TV (channel 2) in Pittsburgh and KPIX (channel 5) in San Francisco.KYW-TV's switch to CBS prompted the network to sell its longtime Philadelphia O&O WCAU-TV (channel 10) to NBC (incidentally, New World briefly considered purchasing WCAU with the intent to convert it into a Fox affiliate; Paramount Stations Group would sell that network's existing affiliate WTXF-TV (channel 29) to Fox Television Stations, while in turn, acquiring independent station WGBS (channel 57, now CW owned-and-operated station WPSG) – which Fox attempted to purchase in August 1993, before terminating that deal to acquire WTXF – from Combined Broadcasting).After CBS discovered that an outright sale of WCAU would have resulted it having to pay a high tax rate from the proceeds accrued, CBS, Group W and NBC entered into a complex trade deal involving four stations which took effect on September 10, 1995.