In 1967, he married Susanne Durst, a Danish national whom he met in Denmark after college.[12][13] They have three children.[1] His daughter Anita Durst is the founder of Chashama, a charity dedicated to locating affordable or free studio and gallery space for artists in New York City.[14][15] Alexander Durst is vice president at the family company.[16] Helena Rose Domino is vice president at the Durst Organization.[17][18]
He served on the Real Estate Council at the Metropolitan Museum of Art from 2004 to 2019 and currently sits on the Board of Directors at Roundabout Theater Company.[19]
Douglas Durst suffered a severe leg injury in 1972 when a coal-fired water heater exploded in a Newfoundland house where he was then living with his wife and young family. After suffering more than four decades of pain, despite many years of surgery, part of Durst's lower right leg was amputated in 2015. He walks today with the help of a prosthesis.[20]
Douglas and his brother Robert had a contentious childhood. As children, they were both put in therapy to help resolve their differences.[21] When they became adults, both eventually worked in the family business. As oldest brother, Robert believed he would be the natural successor to his father as the leader of the Durst Organization. When their father Seymour chose Douglas over him in 1992, Robert estranged himself from his entire family and in 2006 sued for his share of the Durst family trust. A $65 million settlement was reached that divested Robert of all future share of the Durst family wealth. In 2001, Robert Durst was charged with murdering a neighbor and dismembering his body in Galveston, Texas. Pleading self-defense, he was acquitted of the murder charge.[3] Douglas was interviewed by The New York Times in January 2015, and was quoted as saying about Robert: "There's no doubt in my mind that if he had the opportunity to kill me, he would."[22]
Douglas Durst told The New York Times in December 2015 that he believed, until 2001, in his brother's innocence regarding Kathleen McCormack Durst's "disappearance" in 1982. Contrary to his brother's assertions to the documentary filmmakers of The Jinx, he was never privy to his father's meetings with a lawyer and private detective tasked with investigating Kathleen's disappearance.[20] "I'm going to be a witness in Los Angeles" for the prosecution of his brother for the murder of Susan Berman, whom investigators believe Durst murdered because she knew details of Robert's role in his wife Kathleen's death, "so they don't want me to talk too much about anything after 2001", Douglas Durst said. On June 28, 2021, Douglas Durst appeared in court as a witness for the prosecution in the Susan Berman murder trial, saying he was not happy to testify against his brother and only appeared under threat of subpoena. He said Robert's wife Kathie told him she was going to seek a divorce from Robert. Robert told him and his wife that Kathie had vanished a couple of days after he put her on a train to New York City from their lakeside house in Westchester County, and that was the last time he saw her. "His tone was very neutral," Douglas Durst said. "There was no great anxiety in his tone. It seemed a little strange.” Douglas said growing up as children his brother Robert "Treated me miserably. He would fight with me at every chance. He would embarrass me." Douglas said Robert would "like to murder me”, and he had not spoken to Robert since 1999.[23] Robert died in prison in January 2022.[24][25]