In the last 90 days, 22 listings have been made available, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 5% of the available leases in the Alexandria are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 370 sqft. Most properties in this area are around 1 stories. Most buildings in this market were built in 1994 and are Class A.