The typical asking rate per listing is in the $20's per square foot per year. The Des Moines submarket is going through a an increase in rates. In the last 3 months, the median rate increased $7 per sqft per year. That's a 42% rise in rent.
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 discounted submarket.
In the last 90 days, 2 listings have been listed, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 50% of the available space 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.
Even though the median size is 6,200 sqft, there are still 0 new availabilities below 2,000 sqft. Most buildings in this market are approximately 2 floors. Most buildings in this area were built in 1984 and are Class B.