The typical asking rate per listing is in the $20's per square foot per year. The Des Moines submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $26 per sqft per year.
Compared to the rest of the Seattle Metropolitan Area market, the Des Moines submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 2 listings have been listed, which means spaces might be going fast. You'll want to be prepared to tour spaces as quick as possible. About 200% of the listings in the Des Moines are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,670 sqft. Most properties in this area are approximately 2 floors. Most buildings in this market were built in 1984 and are Class B.