The typical asking rate per listing is in the $10's per square foot per year. The Pantops submarket is experiencing a a rise in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 1 listings have been made available, which means leases are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 200% of the available leases in the Pantops 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 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 1,200 sqft. Most buildings in this market are around 3 floors. Most buildings in this region were built in 2008 and are Class B.