On average, listings lease in the $0's per square foot per year. The Green Valley submarket is going through a decline in rates. In the last 3 months, the median rate fell $29 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 7 listings have come on the market, which means listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. 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 sqft. Most properties in this area are close to 2 stories. Most buildings in this market were built in 1986 and are Class B.