The buildings in downtown aren't taller because Sky Harbor is a few miles away and you have planes flying in and out over downtown. The buildings can't be taller or the planes would hit them. Duh.
Best Humbling Fact - 2010
Phoenix is short.
We've long thought Phoenix's skyline was pretty — if a little odd. Why do there appear to be two downtowns, and why does one lone skyscraper — the building formerly known as the Dial Tower — rise up from the earth between them? Then we learned something about our skyline that got us asking another question. Why are we so short? Here's a telling fact: At 483 feet, Chase Tower is Arizona's tallest building. Okay, maybe that number doesn't mean anything to you, so let's put it in perspective. Arkansas has a building that's 546 feet high. We're talking about Arkansas, the land of Walmart and rampant shoelessness. Actually, such less-urbanized and less-populous states as Iowa, Kentucky, Oklahoma, and Nebraska all have buildings taller than the biggest and best of Arizona. Chase Tower wouldn't be one of the 20 tallest buildings in Texas, and that state isn't exactly known for passionate urban planning. Actually, of the country's 10 largest cities, only San Jose, California, has a tallest building shorter than Chase Tower, and, let's be honest: No one knows how or why San Jose is one of the country's 10 largest cities.