Answer:
Because the supply of land in upstate New York perfectly inelastic, buyers in upstate New York economic rent when they purchase their land.
Owners realize that the rental price of land is much lower in Upstate New York than in more densely populated areas like the Upper West Side of New York City. One of the possible explanations for this rent difference is that there is a low demand for land with low productivity.
Some land owners decide to build parking lots in the Upper West Side of New York City. The supply curve for land to be used for parking lots is upward sloping.