The typical asking rate per listing is in the $20's per square foot per year. The Gettysburg submarket is experiencing a a rise in rates. In the last 3 months, the median rate went up $26 per sqft per year.
In the last 90 days, 0 listings have been listed, which means office spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the available leases in the Gettysburg are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 450 sqft. Most buildings in this region were built in 1880 and are Class A.