I think the Tucson Municipal Flying Field pre-dated the one referred to on the original message.
There is a lot of information on Tucson Downtown on Paul Freeman's site that Doug mentioned.
http://www.airfields-freeman.com/AZ/Airfields_AZ_Tuscon_SE.html#downtowntuscson
You can still see much of the old airport on Google Maps or Google Earth.
http://maps.google.com/maps?t=h&hl=en&ie=UTF8&ll=32.187236,-110.950456&spn=0.018995,0.027637&z=15
Chris Kennedy