Most listings are in the $10's per square foot per year. The Henderson County region is experiencing a a rise in rates. In the last 3 months, the median rate increased $20 per sqft per year. That's a Inf% increase in rent.
In the last 90 days, 30 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 3% of the office spaces in the Henderson County are subleases, so you will probably have to consider a longer term lease. 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 1,360 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1982 and are Class B.