It's just a folklore that lightning would never strike the same place twice. Last year, on June 30, 2014, three skyscrapers from Chicago were struck by lightning 17 times - 10 strikes to the Sears (Willis) Tower, 8 to the Trump Tower, and 4 to the John Hancock Center. So be assured that lightning can surely strike any location more than once, and probably at the same spot over and over again, given enough time. It may take as little as few seconds in a thunderstorm, or as long as millions of years - but lightning will eventually strike the same place twice.
Deodatta V. Shenai-Khatkhate