Most listings are in the $20's per square foot per year. The Loudoun County submarket is experiencing a a rise in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 1% rise in rent.
In the last 90 days, 34 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 150% of the available leases in the Loudoun County 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.
Even though the median size is 2,880 sqft, there are still 0 new availabilities below 2,000 sqft. Most properties in this region are around 2 stories. Most buildings in this market were built in 2000 and are Class A.