The largest office relocation in downtown Orlando this year won’t happen as scheduled, which likely will affect other company moves in the urban core. Atlanta-based SunTrust Banks Inc. (NYSE: STI) plans to shift its Orlando headquarters into the still-under-construction SunTrust Plaza at Church Street Station by December, SunTrust spokesman Thomas Crosson said. Previously, the largest bank in Central Florida expected to make its 90,000-square-foot move by August with its roughly 250,000 square feet of former office space opening up by October.