The typical asking rate per listing is in the $10's per square foot per year. The Roanoke County region is experiencing a a boost in rates. In the last 3 months, the median rate went up $17 per sqft per year.
In the last 90 days, 14 listings have been listed, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the listings in the Roanoke 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 2,450 sqft. Most properties in this area are approximately 2 stories. Most buildings in this area were built in 1988 and are Class B.