Manhattan could have 3x the number of apartments by increasing average building size, granted transportation would become an even larger problem. However, when you increase the cost to live somewhere you decrease the number of people who want to live there so it's probably not a problem.
IMO rent control is best when it limits how much above inflation you can increase rent per year. At 3.5% over inflation you can basically double the real cost over 20 years, but people can plain ahead and know they will not be forced out next year. The major problems seem to occur when rent suddenly goes up 20 percent with little notice or fall significantly below market.
PS: London and Paris are less developed than Manhattan, but they seem to want to maintain their historic look which limits growth. DC has started building down because they can't increase building height which is extremely expensive.
IMO rent control is best when it limits how much above inflation you can increase rent per year. At 3.5% over inflation you can basically double the real cost over 20 years, but people can plain ahead and know they will not be forced out next year. The major problems seem to occur when rent suddenly goes up 20 percent with little notice or fall significantly below market.
PS: London and Paris are less developed than Manhattan, but they seem to want to maintain their historic look which limits growth. DC has started building down because they can't increase building height which is extremely expensive.