On average, listings lease in the $30's per square foot per year. The Vero Beach submarket is going through a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 16% rise in rent.
In the last 90 days, 8 listings have been made available, which means new listings are probably 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 2,000 sqft. Most properties in this market are approximately 2 floors. Most buildings in this region were built in 1989 and are Class B.