Tours of the historical “Wall Street of Pittsburgh” are getting a modern twist.

Mark Houser, a Pittsburgh Magazine correspondent and local historian who has written articles and books about Downtown’s skyscrapers and famous streets, will be leading smartphone tours on Saturday, Oct. 11, of Fourth Avenue — the city’s former financial district that was once known as the “Wall Street of Pittsburgh.”

His project, gofourthpittsburgh.org, will launch a new smartphone tour on that day, which actually will be free for anyone to explore. As part of the launch, he will be leading three, one-hour tours for a nominal fee, whose proceeds will go to charity.

The tours (starting at 11 a.m., 12:30 and 2 p.m.) will discuss about two dozen buildings from Smithfield Street to PPG Place — all with fascinat

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