On average, listings lease in the $10's per square foot per year. The Ithaca submarket is seeing a a boost in rates. In the last 3 months, the median rate rose $20 per sqft per year.
In the last 90 days, 3 listings have come on the market, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. 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 720 sqft. Most properties in this market are around 12 stories. Most buildings in this area were built in 1965 and are Class A.