So many of these cities feel like they have to retain their "identity" or the "feel" of the town, so they set restrictions that make it very hard to develop properties that can hold more people. The result is always the same: continually increasing prices in the center of the city whether you want to rent or buy, so you have to go further and further out to find something affordable, especially if you are young or if your parents can't help you finance a purchase.
This is going to continue until planning commissions start allowing the construction of higher density housing.