The Vamp Building is a historic factory building at 3-15 Liberty Square in downtown Lynn, Massachusetts. The eight-story brick building was built in 1903 as the Lynn Realty Company Building #4 to a design by local architect Henry Warren Rogers, and was extended over the next four years to occupy the entire city block bounded by Washington Street, Union Street, and Liberty Square. The "flatiron" V-shape of the building was the basis for its name, as it resembles the shape of the vamp of a shoe. The building served in its early years as a home for all manner of businesses related to the manufacture of shoes. At the time of its construction it was the largest brick building of its kind in the world.