The typical asking rate per listing is in the $20's per square foot per year. The Dunedin submarket is going through a an increase in rates. In the last 3 months, the median rate went up $4 per sqft per year. That's a 20% rise in rent.
In the last 90 days, 2 listings have been listed, which means new listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 650% of the office spaces in the Dunedin 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 available, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 2,360 sqft. Most buildings in this region are approximately 2 floors. Most buildings in this market were built in 1979 and are Class A.