[Illustration: The Organization of American States Building is made
of marble and was dedicated in 1910.]
This marble building was dedicated in 1910. Two sculptures in the front
of the building show some alteration crusts in sheltered areas and
dissolution in exposed areas. In back of the building the marble
balusters on the patio are covered with blackened crusts, especially on
the sides facing the garden. In many places the crusts have blistered or
spalled off, exposing new surfaces to alteration. In general, the patio
sides of the balusters are in much better condition than the sides that
face the garden, perhaps because washing of the patio has washed off the
gypsum crusts on that side of the balusters.
[Illustration: Blackened gypsum crusts may blister and spall off,
exposing a crumbling stone surface to further pollution.]
Continue north through the garden and parking lot and cross C Street
to the Daughters of the American Revolution (DAR) Buildings.