Most listings are in the $20's per square foot per year. The Casas Adobes region is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 3% decline in rent.
Compared to the rest of the Tucson Metropolitan Area market, the Casas Adobes region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 37 listings have come on the market, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 5% of the listings in the Casas Adobes 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,400 sqft. Most properties in this area are around 2 stories. Most buildings in this region were built in 1995 and are Class B.