On average, listings lease in the $20's per square foot per year. The Gilbert region is experiencing a an increase in rates. In the last 3 months, the median rate increased $3 per sqft per year. That's a 15% rise in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Gilbert submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 66 listings have been made available, so you'll want to check back regularly for new listings. About 2% of the listings in the Gilbert are subleases, so you will probably have to focus your search on direct office leases. 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 2,300 sqft. Most buildings in this region are around 1 floors. Most buildings in this market were built in 2006 and are Class B.