Most listings are in the $10's per square foot per year. The Tulsa region is going through a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 14% decrease in rent.
In the last 90 days, 180 listings have been made available, so you'll want to check back regularly for new listings. About 88% of the available space in the Tulsa 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,300 sqft. Most buildings in this area are around 2 floors. Most buildings in this area were built in 1981 and are Class B.