The company was founded in 1900 in New York City when Paul Block, a German immigrant who came to the United States fifteen years prior, formed an ad representation firm for newspapers.
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Other investors include Chicago real estate developer Harvey Walken, Pittsburgh contractor Frank Schneider and Pittsburgh businessman Frank Fuhrer as well as Block Communications co-owner and Pittsburgh Post-Gazette publisher William Block.
Owned by Block Communications, the channel is sister to NBC affiliate WLIO and ABC affiliates WOHL-CD and WLQP-LP; the stations all share studios on Rice Avenue northwest of downtown.