On average, listings lease in the $10's per square foot per year. The Roanoke County region is experiencing a a rise in rates. In the last 3 months, the median rate increased $2 per sqft per year. That's a 9% rise in rent.
In the last 90 days, 26 listings have been made available, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. 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 1,500 sqft. Most properties in this market are approximately 2 floors. Most buildings in this area were built in 1953 and are Class B.