On average, listings lease in the $30's per square foot per year. The Manassas Park region is seeing a an increase in rates. In the last 3 months, the median rate went up $0 per sqft per year. That's a 1% rise in rent.
Compared to the rest of the Washington D.C. market, the Manassas Park submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 12 listings have been listed, which means new availabilities most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. 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 200 sqft. Most buildings in this market were built in 1983 and are Class B.