The typical asking rate per listing is in the $20's per square foot per year. The Arizona submarket is going through a an increase in rates. In the last 3 months, the median rate went up $1 per sqft per year. That's a 5% rise in rent.
In the last 90 days, 1683 listings have come on the market, so you'll want to check back regularly for new listings. About 1% of the available space in the Arizona 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,800 sqft. Most buildings in this area are approximately 2 stories. Most buildings in this region were built in 1990 and are Class B.