On average, listings lease in the $20's per square foot per year. The Washington submarket is going through a a rise in rates. In the last 3 months, the median rate increased $8 per sqft per year. That's a 50% rise in rent.
In the last 90 days, 5 listings have been made available, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 3,060 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this market are approximately 2 floors. Most buildings in this market were built in 1970 and are Class B.