The top of the tower contained a dome covering the top three stories, capped by a lantern measuring across at the base, stretching tall. The dome's roof was made of slate, while the roof ornamentation, dormers, and lantern were made of copper sheeting. In its final years, the dome's trapezoidal skylights were replaced with dormer windows. Though the top of the lantern was above ground level, a steel flagpole rose above the lantern, bringing the height of the Singer Tower to when measured from ground to tip. The flagpole was actually long, but the base of the flagpole was embedded into the tower. The tower was lit at night by 1,600 incandescent lamps and thirty projectors, which were visible at distances of up to .