The typical asking rate per listing is in the $10's per square foot per year. The Casa Grande region is experiencing a a boost in rates. In the last 3 months, the median rate rose $1 per sqft per year. That's a 7% rise in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Casa Grande region has lower rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 6 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 33% of the available leases in the Casa Grande are subleases, so you might be able to sign a shorter term by taking over a previous 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 2,280 sqft. Most buildings in this market are around 1 stories. Most buildings in this area were built in 2003 and are Class B.