Most listings are in the $0's per square foot per year. The Ross region is going through a decline in rates. In the last 3 months, the median rate fell $59 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 1 listings have come on the market, which means new availabilities are probably going fast. You'll want to be prepared to make an offer immediately. 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 sqft. Most buildings in this region were built in 1936 and are Class B.