On average, listings lease in the $40's per square foot per year. The McLean region is seeing a a boost in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 10% rise in rent.
Compared to the rest of the Washington D.C. market, the McLean region has greater rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 2 listings have been listed, which means leases might be leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 1,850 sqft. Most properties in this area are approximately 5 stories. Most buildings in this region were built in 1980 and are Class B.