Building Heights in Area

I found basically the same information as what other people have posted but here is a building height calculator I found:

http://www.ctbuh.org/TallBuildings/HeightStatistics/HeightCalculator/tabid/1007/language/en-US/Default.aspx

as well as a website that shows general building heights in number of floors:

http://www.emporis.com/neighborhood/southtown-centralloop