The typical asking rate per listing is in the $20's per square foot per year. The Oldsmar region is going through a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 18% increase in rent.
In the last 90 days, 7 listings have been made available, which means office spaces most likley are 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 1,200 sqft. Most properties in this area are approximately 1 stories. Most buildings in this market were built in 1985 and are Class A.