On average, listings lease in the $20's per square foot per year. The Fredericksburg region is seeing a a boost 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 Fredericksburg region has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 23 listings have been made available, which means office spaces most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 222% of the available leases in the Fredericksburg are subleases, so you might be able to snag a great spot on a short term. 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 1,850 sqft. Most properties in this market are close to 2 floors. Most buildings in this market were built in 1974 and are Class B.