Most listings are in the $40's per square foot per year. The Arlington County submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $3 per sqft per year. That's a 6% decrease in rent.
In the last 90 days, 34 listings have come on the market, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 21% of the available leases in the Arlington County 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 5,040 sqft, there are still 0 listings below 2,000 sqft. Most properties in this area are around 12 floors. Most buildings in this region were built in 1986 and are Class A.