The typical asking rate per listing is in the $20's per square foot per year. The Manassas region is experiencing a a boost in rates. In the last 3 months, the median rate went up $9 per sqft per year. That's a 49% rise in rent.
Compared to the rest of the Washington D.C. market, the Manassas submarket has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 31 listings have been made available, which means office spaces are probably going fast. 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 1,650 sqft. Most properties in this market are around 2 floors. Most buildings in this region were built in 1988 and are Class B.