Most listings are in the $10's per square foot per year. The Eldersburg region is going through a an increase in rates. In the last 3 months, the median rate rose $16 per sqft per year.
Compared to the rest of the Greater Baltimore market, the Eldersburg region has lower rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 4 listings have been posted online, which means new listings are probably going fast. You'll want to be prepared to make an offer immediately. About 100% of the available leases in the Eldersburg are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,250 sqft. Most buildings in this region are approximately 1 stories. Most buildings in this market were built in 1996 and are Class B.