Most listings are in the $30's per square foot per year. The Kent submarket is seeing a a rise in rates. In the last 3 months, the median rate rose $12 per sqft per year. That's a 63% rise in rent.
Compared to the rest of the Seattle Metropolitan Area market, the Kent region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 5 listings have come on the market, which means new availabilities most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 40% of the listings in the Kent 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 on the market, so finding a space for a small business might be tough.
Even though the median size is 4,610 sqft, there are still 0 leases below 2,000 sqft. Most properties in this market are around 2 floors. Most buildings in this region were built in 1986 and are Class A.