On average, listings lease in the $20's per square foot per year. The Manassas region is going through a an increase in rates. In the last 3 months, the median rate increased $26 per sqft per year.
Compared to the rest of the Washington D.C. market, the Manassas submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 29 listings have come on the market, which means new listings might be going fast. You'll want to be prepared to make an offer immediately. About 103% of the office spaces in the Manassas are subleases, so you might be able to find a shorter term or below market rent. 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 office spaces below 2,000 sqft. Most buildings in this area are around 2 floors. Most buildings in this market were built in 1989 and are Class B.