While there's little to no chance you'll be able to take up residence in the Library of Congress, you can still live in a condo designed by the Library of Congress architect, Paul J. Pelz. Constructed around 1901, this Embassy Row mansion known as the Argyle House was designed for a Navy Commander before it was sold and used by the Costa Rican and Salvadorean Legations. Later, the wife of Joseph Hirshhorn, the founder of the Hirshhorn Museum, used the house to store a portion of her art collection inside. The development wasn't converted into a condo building until the Great Depression. Below, you can check out a photo gallery of one of the two-bedroom, two-bathroom units on the market inside this development. With an asking price of $725,000, this penthouse offers a private elevator, rooftop deck, and 18-foot-high vaulted ceilings. According to the listing, the unit also comes with a washer and dryer and a wood burning fireplace from Italy.