Most listings are in the $20's per square foot per year. The Gettysburg submarket is going through a a boost in rates. In the last 3 months, the median rate increased $26 per sqft per year.
In the last 90 days, 0 listings have been made available, which means new listings are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the office spaces in the Gettysburg are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 450 sqft. Most buildings in this area were built in 1880 and are Class A.