On average, listings lease in the $20's per square foot per year. The Manassas County submarket is seeing a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 12% increase in rent.
In the last 90 days, 29 listings have come on the market, which means spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 7% of the listings in the Manassas County are subleases, so you will probably have to consider a longer term lease. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,490 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1989 and are Class B.