Compared to the rest of the Tucson Metropolitan Area market, the Green Valley 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, 5 listings have been posted online, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 20% of the available space in the Green Valley are subleases, so you might be able to find a shorter term or below market rent. 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 1,870 sqft. Most properties in this area are around 2 stories. Most buildings in this area were built in 1986 and are Class B.