That's not really the case, though. We don't have detailed statistics for bedroom count in New York because a city of just 8 million people with the largest urban economy on the continent can't be expected to track building permits. However in my city, Berkeley, California, the densest city in California outside San Francisco, we get mostly larger apartments. For example I point to the nearly-completed 2587 Telegraph Avenue with 485 bedrooms across 4, 5, and 6-bedroom apartments but only 5 studios. This is a direct outcome of the zoning code that denominates "density" in terms of units, therefore incentivizing the construction of gigantic units with too many bedrooms and forcing people into roomate situations that they don't actually want.