The typical asking rate per listing is in the $30's per square foot per year. The Clayton region is seeing a an increase in rates. In the last 3 months, the median rate went up $34 per sqft per year.
In the last 90 days, 35 listings have come on the market, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 114% of the available space in the Clayton 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,920 sqft. Most properties in this market are approximately 12 floors. Most buildings in this area were built in 1968 and are Class A.