Most listings are in the $10's per square foot per year. The Westminster region is going through a an increase in rates. In the last 3 months, the median rate increased $20 per sqft per year.
Compared to the rest of the Greater Baltimore market, the Westminster submarket has less expensive rates, so you should have no trouble finding a great deal in this undervalued submarket.
In the last 90 days, 2 listings have been posted online, which means new listings are probably leasing quickly. You'll want to be prepared to make an offer immediately. About 700% of the available space in the Westminster are subleases, so you might be able to sign a shorter term by taking over a previous lease. 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 670 sqft. Most buildings in this market are close to 2 floors. Most buildings in this area were built in 1988 and are Class B.