On average, listings lease in the $20's per square foot per year. The Gettysburg submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $28 per sqft per year.
In the last 90 days, 0 listings have been posted online, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. About Inf% of the available space in the Gettysburg 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 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 market were built in 1950 and are Class B.