For example, like Chase Tower, FNC, City Place, Oklahoma Tower, SandRidge Center, Leadership Square, Valliance Bank Tower, 50 Penn Place, etc.

In this link under tallest buildings to the left you can click on each skyscraper you want to research!http://en.wikipedia.org/wiki/List_of_tallest_buildings_in_Oklahoma_City and if that doesnt have what you want try the Emporis database http://www.emporis.com/application/?nav=city&lng=3&id=101327 or this which actually tells sq.footage numbers http://www.highbeam.com/doc/1P2-5631720.html