Most listings are in the $20's per square foot per year. The La Plata submarket is seeing a an increase in rates. In the last 3 months, the median rate increased $26 per sqft per year. That's a Inf% rise in rent.
Compared to the rest of the Washington D.C. market, the La Plata region has less expensive rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 1 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 900 sqft.