Long Island, New York about 1890. In an effort to keep his family near him, he purchased large tracts of land surrounding his estate, totaling 1,100 acres (4.5 km²). However, he died the next year, 1891, in New York City. At Glen Cove, on Long Island, Pratt's six sons and two daughters later built their homes. As of 2004, most of the extant Pratt mansions along the Gold Coast there are still in use: Welwyn, originally the home of Harold I. Pratt, is now the Holocaust Memorial and Tolerance Center of Nassau County. The Braes, originally owned by Herbert L. Pratt, is now the Webb Institute of Naval Architecture. The Manor House, built for John Teele Pratt, is now the Glen Cove Mansion Hotel and Conference Center. Poplar Hill, the Frederic B. Pratt house, is now owned by Glengariff Nursing Home. Killenworth, originally the house of George Dupont Pratt, is now the retreat for the Soviet Delegation to the United Nations. The current Charles Pratt & Co. exists, according to its website "as a central administrative office providing professional financial services for the descendants of Charles Pratt and selected other private clients." See also Charles Pratt South Improvement Company Henry H. Rogers Standard Oil Pratt Institute Ida M. Tarbell Notes References Elbert Hubbard, 1909, Little Journeys to the Homes Tarbell, Ida M. 1904, The History of Standard Oil History of Glen Cove, Long Island Council for Advancement and Support of Education (CASE) website, Pratt Institute page Pratt Institute official website, History page Defunct oil companies of the United States Standard Oil Defunct companies based in New York City Energy companies established in 1867