The typical asking rate per listing is in the $0's per square foot per year. The Arlington region is going through a decrease in rates. In the last 3 months, the median rate decreased $25 per sqft per year. That's a 100% decrease in rent.
In the last 90 days, 0 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the office spaces in the Arlington are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 sqft. Most properties in this region are close to 3 floors. Most buildings in this area were built in 1990 and are Class B.