Most listings are in the $30's per square foot per year. The Arlington region is going through a a rise in rates. In the last 3 months, the median rate went up $12 per sqft per year. That's a 60% increase in rent.
Compared to the rest of the Seattle Metropolitan Area market, the Arlington region has smaller rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 0 listings have been listed, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the office spaces in the Arlington 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,000 sqft. Most buildings in this market are approximately 1 stories. Most buildings in this market were built in 1996 and are Class B.