They were simply selling apartments at market price. You fundamentally cannot increase the price of a good by selling it. What's more likely is that housing pr

They were simply selling apartments at market price. You fundamentally cannot increase the price of a good by selling it. What's more likely is that housing prices in your area have gone up so much that even apartments are now more expensive than what you originally paid. If there had been sufficient supply built in the market then prices wouldn't be so high. China has solved this problem by telling NIMBYs to fuck off and just confiscating their property to be redeveloped. I don't see why upzoning can somehow be considered bad.