On average, listings lease in the $10's per square foot per year. The Alexandria region is experiencing a a boost in rates. In the last 3 months, the median rate rose $16 per sqft per year.
In the last 90 days, 19 listings have come on the market, which means new availabilities might be 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.
The standard measurement for office space in this area is around 2,020 sqft. Most buildings in this area are around 1 stories. Most buildings in this area were built in 0 and are Class B.