The typical asking rate per listing is in the $20's per square foot per year. The Washington region is experiencing a a boost in rates. In the last 3 months, the median rate rose $22 per sqft per year.
In the last 90 days, 963 listings have been made available, so you'll want to check back regularly for new listings. About 163% of the available space in the Washington are subleases, so you might be able to sign a shorter term by taking over a previous 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 2,020 sqft. Most properties in this market are approximately 2 floors. Most buildings in this region were built in 1984 and are Class A.