Most listings are in the $40's per square foot per year. The Gantt region is going through a a boost in rates. In the last 3 months, the median rate rose $44 per sqft per year.
In the last 90 days, 0 listings have been made available, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the listings in the Gantt 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 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 900 sqft. Most buildings in this market are close to 2 floors.