Most listings are in the $30's per square foot per year. The McLean submarket is experiencing a a rise 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 submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 12 listings have been posted online, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 92% of the available leases in the McLean are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 1,450 sqft. Most buildings in this area are around 3 floors. Most buildings in this region were built in 1980 and are Class A.