The typical asking rate per listing is in the $50's per square foot per year. The Zionsville submarket is going through a a boost in rates. In the last 3 months, the median rate increased $51 per sqft per year.
In the last 90 days, 4 listings have been listed, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 25% of the office spaces in the Zionsville are subleases, so you might be able to snag a great spot on a short term. 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 300 sqft. Most properties in this area are around 1 stories. Most buildings in this market were built in 1996 and are Class A.