Most listings are in the $20's per square foot per year. The Mesa region is seeing a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 13% increase in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Mesa submarket has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 174 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the listings 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,640 sqft. Most buildings in this area are approximately 1 floors. Most buildings in this area were built in 1997 and are Class B.