SPRINGFIELD — Starting again next month, tourists can walk the halls of the building where President Abraham Lincoln practiced law for nine years.The city of Springfield will open a tourist welcome center on the first floor of the three-story building which once served as Lincoln’s law office by the end of October.The welcome center will be located on the southeast corner of the Old Capitol Plaza.This isn’t the first time the building has been open to the public.Lincoln practiced law in the building for …