On average, listings lease in the $30's per square foot per year. The Black Mountain region is going through a a boost in rates. In the last 3 months, the median rate rose $33 per sqft per year.
In the last 90 days, 2 listings have come on the market, which means new availabilities are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 50% of the office spaces in the Black Mountain are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 2,590 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this market are approximately 1 floors. Most buildings in this area were built in 2000 and are Class B.