Most listings are in the $20's per square foot per year. The Maricopa County submarket is going through a decline in rates. In the last 3 months, the median rate decreased $1 per sqft per year. That's a 5% decline in rent.
In the last 90 days, 1463 listings have been listed, so you'll want to check back regularly for new listings. About 2% of the listings in the Maricopa County 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 1,890 sqft. Most buildings in this market are close to 2 stories. Most buildings in this area were built in 1990 and are Class B.