Almost 60% of US households have no kids in them [1]. We can infer demand for Manhattan housing stock by vacancy rates and rent levels [2] [3] [4] [5].
[1] https://www.visualcapitalist.com/how-american-households-hav...
[2] https://www.mns.com/manhattan_rental_market_report
[3] https://inhabit.corcoran.com/nyc-residential-rental-market-r...
[4] https://www.brickunderground.com/rent/nyc-manhattan-brooklyn...
[5] https://www.elliman.com/corporate-resources/market-reports/n...