The typical asking rate per listing is in the $20's per square foot per year. The Towson submarket 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% decrease in rent.
Compared to the rest of the Greater Baltimore market, the Towson submarket 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 been made available, which means new availabilities are probably 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 have to consider a longer term lease. 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 2,200 sqft. Most buildings in this area are close to 5 stories. Most buildings in this area were built in 1977 and are Class B.