The typical asking rate per listing is in the $10's per square foot per year. The Bon Air submarket is going through a decline in rates. In the last 3 months, the median rate decreased $6 per sqft per year. That's a 24% decrease in rent.
In the last 90 days, 5 listings have been made available, which means office spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 80% of the available space in the Bon Air 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,100 sqft. Most buildings in this region are around 2 floors. Most buildings in this region were built in 1987 and are Class B.