The Statue of Liberty is not measured in building stories. Its height is given in absolute linear dimensions.
Story height varies (typically 10–14 feet per floor). The statue is a hollow, copper-sheathed iron framework—not a habitable building—so "stories" is a meaningless metric.
At 151 feet, the statue itself is roughly as tall as a 12- to 15-story building, but that's only a rough analogy, not a formal measurement.