From the article: And perhaps surprisingly, the data indicated that “the vast majority of pieds-à-terre are middle class,” Mr. Miller said. “They are owned by

From the article: And perhaps surprisingly, the data indicated that “the vast majority of pieds-à-terre are middle class,” Mr. Miller said. “They are owned by people who have a studio in the city and a home in the suburbs, or maybe it was their first apartment that they chose to keep and rent it out.” What does middle class people becoming landlords have to do with the rich? Insofar as a flat is being rented out (as many of them are, according to the article), it's not even reducing housing supply.