In the last 90 days, 5 listings have been made available, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 20% of the listings in the Fairfax are subleases, so you might be able to snag a great spot on a short term. 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 sqft. Most properties in this market are around 1 stories. Most buildings in this market were built in 1972 and are Class C.