In the last 90 days, 21 listings have been made available, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 10% of the listings in the Des Moines County are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 properties in this market are approximately 1 floors. Most buildings in this area were built in 1975.