The typical asking rate per listing is in the $20's per square foot per year. The Arlington submarket is experiencing a a rise in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 7% increase in rent.
Compared to the rest of the DFW Metroplex market, the Arlington region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 61 listings have come on the market, so you'll want to check back regularly for new listings. About 7% of the available leases in the Arlington are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,750 sqft. Most properties in this area are approximately 2 stories. Most buildings in this region were built in 1985 and are Class B.