On average, listings lease in the $10's per square foot per year. The Martinsburg submarket is seeing a a rise in rates. In the last 3 months, the median rate went up $16 per sqft per year.
In the last 90 days, 0 listings have been posted online, which means new listings most likley are going fast. You'll want to be prepared to make an offer immediately. About NaN% of the listings in the Martinsburg 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 730 sqft. Most buildings in this region are around 2 stories. Most buildings in this market were built in 1984 and are Class C.