Most listings are in the $20's per square foot per year. The Five Forks submarket is going through a a boost in rates. In the last 3 months, the median rate increased $21 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 200% of the office spaces in the Five Forks 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,180 sqft. Most buildings in this area were built in 2015 and are Class B.