On average, listings lease in the $10's per square foot per year. The Henderson County region is going through a a boost in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 11 listings have been listed, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 164% of the available space in the Henderson County 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 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 1,250 sqft. Most buildings in this area are around 1 stories. Most buildings in this area were built in 1989 and are Class B.