The decision has ended a four-month family drama, but Michael Rotondo plans to appeal the ruling.
It is a case that is splitting opinion along generational lines in the United States.
Two parents have brought their 30-year-old son to court to force him to move out of their house, where he pays no rent and does no housework.
They say he needs to stop relying on them.
Al Jazeera’s Gabriel Elizondo reports from New York.