sentences:  By the 1950s it was purchased by the then Soviet Union to serve as the retreat for the Russian delegation to the United Nations.In 1897, Pratt married Helen Deming Sherman Pratt (1869-1923), the daughter of John Taylor Sherman, a Brooklyn cotton merchant, and great granddaughter of American founding father Roger Sherman; her sister Gertrude Mary (Sherman) Trowbridge was the grandmother of US Secretary of Commerce Alexander Buel Trowbridge, who was also an executive in the Rockefeller/Pratt oil business.They had five children, including the explorer Sherman Pratt and Eliot Deming Pratt, chairman of trustees of Goddard College, Vermont for 15 years, where the Eliot Pratt Center and the Eliot D Pratt Library are named in his honor.