Most listings are in the $20's per square foot per year. The Tucson region is experiencing a decrease in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 11% decline in rent.
Compared to the rest of the Tucson Metropolitan Area market, the Tucson region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 175 listings have been made available, so you'll want to check back regularly for new listings. About 6% of the available leases in the Tucson are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,470 sqft. Most properties in this area are close to 2 stories. Most buildings in this region were built in 1983 and are Class B.