One Franklin Square

One Franklin Square is a high-rise building at 1301 K Street NW, in Washington, D.C. The 64 m (210 ft), 12 story building was completed in 1989, and is the fifth-tallest building in The District, occupying almost the entire north side of the 1300 block of K Street NW across from Franklin Square.

The building is owned and managed by Hines Interests; developed by Prentiss Company and designed by Hartman-Cox Architects and The Dewberry Companies.

One Franklin Square is an important setting in the final act of the 2009 Dan Brown novel, The Lost Symbol.