Most listings are in the $20's per square foot per year. The Tucson region is going through a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 11% decrease in rent.
Compared to the rest of the Tucson Metropolitan Area market, the Tucson region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 174 listings have been posted online, so you'll want to check back regularly for new listings. About 6% of the available space in the Tucson are subleases, so you will probably need to consider the implications of signing a direct lease with the building. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,370 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 1983 and are Class B.