The typical asking rate per listing is in the $30's per square foot per year. The Gilbert submarket is going through a an increase in rates. In the last 3 months, the median rate went up $6 per sqft per year. That's a 21% rise in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Gilbert region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 38 listings have been listed, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. About 3% of the available space in the Gilbert are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 1,440 sqft. Most properties in this market are approximately 1 floors. Most buildings in this area were built in 2006 and are Class B.