The typical asking rate per listing is in the $30's per square foot per year. The Clayton submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $34 per sqft per year.
In the last 90 days, 35 listings have been listed, which means listings are probably going fast. You'll want to be prepared to make an offer immediately. About 114% of the listings in the Clayton 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 1,920 sqft. Most buildings in this market are close to 12 floors. Most buildings in this market were built in 1968 and are Class A.