The St. Nicholas Historic District, known colloquially as "Striver's Row", is a historic district located on both sides of West 138th and West 139th Streets between Adam Clayton Powell Jr. Boulevard and Frederick Douglass Boulevard, in the Harlem neighborhood of Upper Manhattan, New York City. It is both a national and a New York City historic district, and consists of row houses and associated buildings designed by three architectural firms and built in 1891–93 by developer David H. King Jr. These are collectively recognized as gems of New York City architecture, and "an outstanding example of late 19th-century urban design":