Compared to the rest of the Seattle Metropolitan Area market, the Des Moines region has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 1 listings have been made available, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 970 sqft. Most properties in this region are approximately 2 floors. Most buildings in this region were built in 1962 and are Class B.