The United States Courthouse is a rectilinear Neo-Classical Revival composition with Art Deco influences. The plan is rectangular and biaxially symmetrical with respect to the exterior facades, except for a service door on the west side. Rooms are for the most part arranged on either side of an interior corridor around two Light Courts. The elevations are composed of a flat fossilized limestone base, repetitive limestone pilasters separated by windows and a windowless limestone architrave with terra cotta ornament and coping concealing a the fifth floor and a flat roof. The finished stone base extends from grade to the first floor window sill height, where tall casement windows are spanned with limestone panels. The second, third and fourth floor double hung windows are treated as a continuous vertical element between pilasters separated by cast aluminum spandrels. The windowless fifth floor was designed and built with skylights which have now been abandoned. On the facades outside this level the stone architrave is set off with a repeating stylized eagle terra cotta frieze. The fluted pilasters run between the base and architrave, and have no base or capital of their own. The exterior of the building has been largely unaltered with the exception of a limestone faced ramp added for the handicapped. This ramp is compatible with the original building, if less well detailed. Inside the Courthouse additions and alterations have been generally less sensitive. The East Light Court has been enclosed at the first level to accommodate a new courtroom. A second large courtroom was added on the second floor at the west end, two floors below one of the two original courts. These spaces have no historical significance but are adequate and appropriate for their new use. Three other courts have been added to the building, which are of insufficient size and deficient shape for their purpose. Except for the Clerk's Office, functions not directly tied to the Courtrooms have been relocated to renovated spaces, lessening the logic and integrity of the building. Much of the usable basement level has been sacrificed to accommodate hvac ductwork, while the remainder is in original condition. The first floor has been altered to an extent but retains much of its original details and finishes. Almost all of the wood and glass partitions that defined interior spaces and determined their character have been replaced by gypsum board walls. The main public spaces have been best preserved on this level, including the south lobby with its large, important mural across the north wall. The second and third floors retain little of their original character, but the fourth floor retains in largely unaltered form its two courtrooms and its public spaces. The fifth floor was originally toplit and used for storage and a laboratory. With the skylights closed off, it is now dark and confining, housing two Immigration Courts and their related functions. Throughout the building most of the terrazzo flooring, Art Deco hardware, paneled doors with transoms and period light fixtures are still in place.