In the last 90 days, 5 listings have been listed, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 60% of the listings in the Wentzville 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 sqft. Most buildings in this region are around 2 floors. Most buildings in this area were built in 1986 and are Class B.