Building Heights

This site gives a general height(in number of floors) that is up for interpretation.
http://www.emporis.com/neighborhood/southtown-centralloop

However, this site gives a more exact reference height of MOST of the adjacent buildings in the county.

http://www.topozone.com/states/Texas.asp?county=Bexar&feature=Building

While not extensive, this provides a basis to draw from.