It used to be that D.C. architecture consisted of graceful Georgetown mansions, neoclassical federal buildings -- and, of course, the monuments. When the U.S. Commission of Fine Arts was founded in 1910 to guide Washington's architectural development, it reviewed designs such as those of the Lincoln Memorial and the Federal Triangle. Over the seven years I've served on the commission, however, an increasing amount of time is spent discussing security-improvement projects: screening facilities, hardened gatehouses, Delta barriers, perimeter fences, and seemingly endless rows of bollards. We used to mock an earlier generation that peppered the U.S. capital with Civil War generals on horseback; now I wonder what future generations will make of our architectural legacy of crash-resistant walls and blast-proof glass.

How did we become so insecure about our buildings? Although the 9/11 attacks loom large in the public's imagination, the event that changed the way federal buildings in the United States are designed and used -- perhaps forever -- was a presidential directive issued six years prior to the attacks. Historically, U.S. presidents have shown little interest in architecture. You can count the exceptions on one hand: Franklin D. Roosevelt, who designed his own presidential library; Theodore Roosevelt, who had many architect friends and added the West Wing to the White House; and of course America's two great architect-presidents, Thomas Jefferson and George Washington. Mostly, however, presidents have preferred to leave design to designers, whether of public buildings, war memorials, or double eagles. President Bill Clinton, whose most prominent addition to the White House was a hot tub, is not known as an architecture buff. But by issuing Executive Order 12977 in October 1995, he set in motion a process that thrust politics squarely in the center of the design process....