On average, listings lease in the $30's per square foot per year. The Ithaca region is going through a an increase in rates. In the last 3 months, the median rate rose $38 per sqft per year.
In the last 90 days, 3 listings have been posted online, which means leases most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 133% of the available leases in the Ithaca 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 1,600 sqft. Most buildings in this area are around 12 stories. Most buildings in this market were built in 1978 and are Class A.