On average, listings lease in the $10's per square foot per year. The Des Moines submarket is going through a decrease in rates. In the last 3 months, the median rate fell $2 per sqft per year. That's a 10% decline in rent.
Compared to the rest of the Seattle Metropolitan Area market, the Des Moines region has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 1 listings have been listed, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 5,400 sqft, there are still 0 new listings below 2,000 sqft. Most properties in this region are around 2 stories. Most buildings in this area were built in 1962 and are Class B.