The National Union Building: Washington D.C.’s newest and most dynamic downtown private event space. Constructed in 1890, located in the heart of Penn Quarter, just blocks away from the White House, and next door to Ford’s Theater. Featuring multiple private event spaces, our 11 individual venues can host anything from unique 170-person weddings, corporate retreats, and trainings to larger events or conferences -- combine any number of our exclusive spaces to accommodate several hundred guests across multiple wings.