Most listings are in the $20's per square foot per year. The Oviedo submarket is going through a a boost in rates. In the last 3 months, the median rate rose $21 per sqft per year.
In the last 90 days, 14 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 50% of the listings in the Oviedo 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 posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 630 sqft. Most properties in this area are around 1 stories. Most buildings in this market were built in 1997 and are Class B.