The typical asking rate per listing is in the $10's per square foot per year. The Zionsville submarket is going through a a rise in rates. In the last 3 months, the median rate rose $16 per sqft per year.
In the last 90 days, 1 listings have come on the market, which means new availabilities most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 100% of the listings in the Zionsville are subleases, so you might be able to find a shorter term or below market rent. There aren't many listings below 2,000 square feet available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,200 sqft. Most properties in this area are close to 1 stories. Most buildings in this region were built in 1992 and are Class B.