The typical asking rate per listing is in the $10's per square foot per year. The Olivette submarket is experiencing a a boost in rates. In the last 3 months, the median rate rose $15 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means spaces most likley are 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 1,600 sqft. Most buildings in this market were built in 1972 and are Class A.