The American Security and Trust Company Building is a Neoclassical bank office in Washington, D.C., designed by the architectural firm of York and Sawyer. It was listed on the National Register of Historic Places in 1973.DesignThe neoclassical exterior closely matches that of the Riggs National Bank building next door, also designed by York and Sawyer and completed in 1902, so that they are sometimes taken to be a single building. The west facade of the building presents a multiple bay arrangement with two plain bays flanking a hexastyle portico of six Ionic columns and entablature, while the narrower and plainer south face has a single bay with two plain Doric pilasters flanking the entrance in a shallow recess. The parapet conceals three skylights. Although the exterior has two rows of windows, the interior is in fact a single floor, also decorated in the neoclassical style; it was remodeled in 1931 - 1932 but retained essentially the same form excepting the removal of a pair of balconies and new openings into the adjoining annex which was constructed at the same time to the north. A basement floor formerly contained vaults, but with the construction of the annex these were moved to the adjoining building. The building exterior is constructed of granite ashlars with deep horizontal joints at the corners creating a striped effect; the interior is largely faced in a variety of marbles.