On average, listings lease in the $20's per square foot per year. The Manassas submarket is seeing a a boost in rates. In the last 3 months, the median rate went up $7 per sqft per year. That's a 33% rise in rent.
Compared to the rest of the Washington D.C. market, the Manassas region has smaller rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 29 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
Even though the median size is 2,980 sqft, there are still 0 spaces below 2,000 sqft. Most properties in this region are approximately 2 stories. Most buildings in this area were built in 1989 and are Class B.