In the last 90 days, 72 listings have been posted online, so you'll want to check back regularly for new listings. About 1% of the office spaces in the St. Louis County are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,410 sqft. Most properties in this market are around 3 floors. Most buildings in this area were built in 1955 and are Class A.