On average, listings lease in the $10's per square foot per year. The King George County submarket is going through a a rise in rates. In the last 3 months, the median rate increased $15 per sqft per year.
In the last 90 days, 8 listings have come on the market, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 75% of the listings in the King George 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,310 sqft. Most properties in this region are approximately 2 stories. Most buildings in this area were built in 1972 and are Class B.