Most listings are in the $10's per square foot per year. The Chesterfield region is going through a decline in rates. In the last 3 months, the median rate decreased $11 per sqft per year. That's a 40% decrease in rent.
In the last 90 days, 21 listings have come on the market, which means new availabilities most likley are going fast. You'll want to be prepared to make an offer immediately. About 105% of the office spaces in the Chesterfield are subleases, so you might be able to snag a great spot on a short term. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 700 sqft. Most buildings in this market are approximately 3 stories. Most buildings in this area were built in 1998 and are Class B.