Most listings are in the $10's per square foot per year. The Mesa region is experiencing a decrease in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 9% decrease in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Mesa region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 157 listings have been listed, so you'll want to check back regularly for new listings. About 1% of the office spaces in the Mesa are subleases, so you will probably have to consider a longer term lease. 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 1,800 sqft. Most properties in this market are close to 1 floors. Most buildings in this market were built in 1992 and are Class B.