The typical asking rate per listing is in the $10's per square foot per year. The King George County submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $16 per sqft per year.
In the last 90 days, 8 listings have been made available, which means leases most likley are 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 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 1,600 sqft. Most properties in this region are around 2 floors. Most buildings in this region were built in 1991 and are Class B.