Pei's associate Araldo Cossutta was the lead architect for the plaza's North Building (955 L'Enfant Plaza SW), South Building (490 L'Enfant Plaza SW), and Center Building (475 L'Enfant Plaza SW; now the United States Postal Service headquarters).
Pei's associate Araldo Cossutta was the lead architect for the plaza's North Building (955 L'Enfant Plaza SW) and South Building (490 L'Enfant Plaza SW). Vlastimil Koubek was the architect for the East Building (L'Enfant Plaza Hotel, located at 480 L'Enfant Plaza SW), and for the Center Building (475 L'Enfant Plaza SW; now the United States Postal Service headquarters).