Hester Diamond — the mother of rapper Michael Diamond, otherwise known as Beastie Boys co-founder Mike D — has listed for $19.5 million, according to a StreetEasy listing update and a report in the New York Times. The residence has no fewer than 6,300 square feet of living space and more than 800 square feet of terrace space.The late Diamond, who died in 2020 at age 91, lived there for more than 50 years.