Many skyscrapers are novel- there is a certain prestige, and thus premium- to having an office in the Sears tower or the Burj Khalifa. That is added on to the

Many skyscrapers are novel- there is a certain prestige, and thus premium- to having an office in the Sears tower or the Burj Khalifa. That is added on to the fact that skyscrapers are also engineering marvels, and the cost per unit goes up quite a bit once you have to start dealing with those problems, compared to the much more standard 6 story building as an example. An additional novelty factor is that actually supporting the weight of the tower will require different techniques (and significantly higher costs) depending on the type of land the desired build site happens to be on. All of these things create something of a price floor for rents.