Philanthropist Brooke Astor's estate (former)

Philanthropist and socialite and chairwoman of the Vincent Astor Foundation Brook Astor died in her 65 acres "Holly Hill" estate on Aug. 13 at age 105.

She was known as New York City’s unofficial first lady, establishing her presence in both the luxury apartments of Fifth Avenue and the tenements of East Harlem, using her inherited millions to help the less fortunate.

Mrs. Astor’s money came from her third husband, Vincent Astor, who was heir to the fur and real estate fortune of John Jacob Astor and who when he died left about $60 million to her personally, and an equal amount for a foundation “for the alleviation of human suffering.”

Hedge fund manager Ron Gutfleish purchased it in 2012 for $6.45 million.