This doesn't really apply to Manhattan, but elsewhere in New York and most other cities there are a lot of 2-3 story buildings still, many of which are single-f

This doesn't really apply to Manhattan, but elsewhere in New York and most other cities there are a lot of 2-3 story buildings still, many of which are single-family homes. Some of those are worth keeping, but in many cases they could be replaced with 4-6 story mixed-use buildings with little objection. That's an instant doubling in density without having to resort to high-rises. Paris, for example, maintains a higher population density than New York or San Fransisco with a lower average building height. European cities also see huge gains in density because they dedicate less space to roads and parking, a practice American city planners are catching on to. There is so much we could be doing to avoid housing shortages if we actually tried. Too bad everyone is so fixated on the value of their property going up.