A five-story brick structure coated with smooth plaster, the floors of the Winder Building were constructed of cast-iron beams with segmental brick vaults struck between them. This fireproof technique was introduced to Washington by James Renwick in part of the Smithsonian Building. Although privately financed as a speculative venture of William H. Winder and a modest building by
The just-restored look dates from the completion of the Federal Home Loan Bank Board building to the north and includes a modern brick retaining wall matching the brick of Liberty Plaza, which ties the Winder Building to the larger complex.