The typical asking rate per listing is in the $10's per square foot per year. The Mesa region is going through a decline in rates. In the last 3 months, the median rate decreased $2 per sqft per year. That's a 10% decrease in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Mesa submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 182 listings have been listed, so you'll want to check back regularly for new listings. About 65% of the available space in the Mesa are subleases, so you might be able to find a shorter term or below market rent. 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 1,340 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this region were built in 1988 and are Class B.