Most listings are in the $10's per square foot per year. The Buckeye region is experiencing a a boost in rates. In the last 3 months, the median rate increased $16 per sqft per year.
Compared to the rest of the Phoenix Metropolitan Area market, the Buckeye region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 3 listings have been listed, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 2,260 sqft. Most buildings in this region were built in 2008 and are Class B.