In August 1890, the 246 offices of the building were illuminated for an entire week to honor the Detroit International Exposition. Edison incandescent lights and gas were utilized to light up the offices. During the day, the offices of the building were opened to allow visitors to tour the building. Throughout the life of the building incandescent lights had a usage sufficient for Westinghouse Electric & Manufacturing Company's Incandescent Lamp Division carried a stock in Detroit specifically for the Hammond Building.