Here's another article cutting a height restriction near 500 feet. http://www.structuremag.org/?p=11635 http://www.structuremag.org/?p=11635 There are probabl

Here's another article cutting a height restriction near 500 feet. http://www.structuremag.org/?p=11635 http://www.structuremag.org/?p=11635 There are probably more height restrictions in different areas, and a 500 foot limit is actually quite restrictive. It would have prevented Salesforce Tower. The Empire State Building is over 100 floors.