On average, listings lease in the $10's per square foot per year. The Sherman region is seeing a an increase in rates. In the last 3 months, the median rate increased $18 per sqft per year. That's a Inf% rise in rent.
In the last 90 days, 11 listings have been listed, which means leases are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 490 sqft. Most buildings in this area are around 5 floors. Most buildings in this market were built in 1996 and are Class B.