The typical asking rate per listing is in the $20's per square foot per year. The Maricopa County region is going through a a rise in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 3% rise in rent.
In the last 90 days, 1763 listings have been posted online, so you'll want to check back regularly for new listings. About 4% of the listings in the Maricopa County 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 2,350 sqft. Most buildings in this market are close to 2 stories. Most buildings in this market were built in 1994 and are Class B.