This is in fact one reason why areas get gentrified. You cannot build anything new in many pricier parts of town although the better, often more central locatio

This is in fact one reason why areas get gentrified. You cannot build anything new in many pricier parts of town although the better, often more central location would make it economically very interesting. It's so often zoned as done historic area and thus new development moves to the cheaper areas. I'm not saying it's the only reason, but it certainly makes the problem much worse.