On average, listings lease in the $20's per square foot per year. The Gettysburg region is experiencing a a boost in rates. In the last 3 months, the median rate increased $1 per sqft per year. That's a 5% rise in rent.
In the last 90 days, 0 listings have been posted online, which means spaces are probably leasing quickly. You'll want to be prepared to make an offer immediately. About Inf% of the listings 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 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 1920 and are Class C.