Margaret saved a row of Neo-Federal townhouses on Park Avenue designed by McKim, Mead & White from destruction by purchasing the property and giving one of the townhouses to the Queen Sofía Spanish Institute in 1965.
She then donated the corner townhouse to her cousin, David Rockefeller, who there founded the Center for Inter-American Relations, now the Americas Society.
In December 1979, Margaret donated her father's estate, Villa Le Balze in Fiesole, Tuscany, Italy to Georgetown University which operates an overseas campus there.
[2] Her life can be read at El Inútil de la Familia, a book written by Jorge Edwards, a Chilean writer.
She married Chilean ballet businessman George de Cuevas on August 3, 1927.