The typical asking rate per listing is in the $10's per square foot per year. The Black Mountain submarket is experiencing a a rise in rates. In the last 3 months, the median rate went up $17 per sqft per year.
In the last 90 days, 4 listings have been made available, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 125% of the office spaces in the Black Mountain 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.
Even though the median size is 7,000 sqft, there are still 0 new listings below 2,000 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 2000 and are Class B.