Most listings are in the $20's per square foot per year. The Gilbert submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $25 per sqft per year.
Compared to the rest of the Phoenix Metropolitan Area market, the Gilbert region has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 38 listings have come on the market, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 121% of the available space in the Gilbert are subleases, so you might be able to snag a great spot on a short term. 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 1,000 sqft. Most properties in this region are close to 1 floors. Most buildings in this region were built in 2006 and are Class B.