The typical asking rate per listing is in the $20's per square foot per year. The Towson region is going through a decrease in rates. In the last 3 months, the median rate decreased $5 per sqft per year. That's a 17% decline in rent.
Compared to the rest of the Greater Baltimore market, the Towson region has smaller rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 38 listings have come on the market, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 3% of the available space in the Towson are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,200 sqft. Most buildings in this region are close to 5 floors. Most buildings in this market were built in 1977 and are Class B.