On average, listings lease in the $10's per square foot per year. The Burke submarket is going through a a boost in rates. In the last 3 months, the median rate went up $18 per sqft per year.
Compared to the rest of the Washington D.C. market, the Burke submarket has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 0 listings have been posted online, which means leases are probably leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the listings in the Burke are subleases, so you might be able to find a shorter term or below market rent. 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 2,000 sqft. Most buildings in this area are around 3 stories. Most buildings in this region were built in 1985 and are Class B.