In the last 90 days, 5 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 20% of the available space in the Oro Valley are subleases, so you might be able to snag a great spot on a short term. 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 buildings in this area are around 2 stories. Most buildings in this region were built in 2002 and are Class A.