(Blurred for possible spoilers) Yes, and the book makes it clear that the hedge fund manager has made an extremely unusual choice living there. He is not a member of the co-op, and is barely tolerated by the co-op management, but permitted to stay because the huge fat fee he pays helps keep the co-op solvent. His choice is motivated by the idea of living somewhere from which he can zoom to work in his boat every day. The other two you mention are a treehugger and a social worker, and both are committed to smashing the capitalist system. For them, living in the co-op is a lifestyle choice that fits with their value system. This is not an upper middle class neighbourhood.
