On average, listings lease in the $40's per square foot per year. The McLean region is seeing a an increase in rates. In the last 3 months, the median rate went up $7 per sqft per year. That's a 22% increase in rent.
Compared to the rest of the Washington D.C. market, the McLean submarket has more expensive rates, and you'll need to make a great offer to be in this hot submarket.
In the last 90 days, 10 listings have come on the market, which means new availabilities 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 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 960 sqft. Most properties in this region are around 5 stories. Most buildings in this region were built in 1980 and are Class A.