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CLEVELAND, OHIO — KeyCorp has signed a 15-year lease extension for 487,000 square feet at Key Tower in Cleveland. The new lease begins July 1, 2015, and extends through June 2030. Columbia Property Trust has owned the 57-story Class-A office tower since December 2005. The 1.3 million-square-foot property has served as the headquarters of KeyCorp., the holding company for KeyBank, since the tower’s construction in 1991.