On average, listings lease in the $10's per square foot per year. The Arlington region is seeing a decline in rates. In the last 3 months, the median rate fell $1 per sqft per year. That's a 6% decrease in rent.
Compared to the rest of the DFW Metroplex market, the Arlington submarket has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 102 listings have been made available, so you'll want to check back regularly for new listings. About 1% of the office spaces in the Arlington are subleases, so you will probably have to consider a longer term 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 1,680 sqft. Most buildings in this market are around 2 floors. Most buildings in this area were built in 1985 and are Class B.