On average, listings lease in the $20's per square foot per year. The Baltimore County submarket is going through a a rise in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 2% rise in rent.
Compared to the rest of the Greater Baltimore market, the Baltimore County submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued region.
In the last 90 days, 116 listings have come on the market, so you'll want to check back regularly for new listings. 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 2,080 sqft. Most buildings in this region are around 3 stories. Most buildings in this area were built in 1963 and are Class A.