Most listings are in the $20's per square foot per year. The Westchase region is going through a an increase in rates. In the last 3 months, the median rate increased $29 per sqft per year.
In the last 90 days, 4 listings have been made available, which means new availabilities are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 25% of the available leases in the Westchase are subleases, so you might be able to snag a great spot on a short term. 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 1,500 sqft. Most properties in this market are around 1 floors. Most buildings in this market were built in 1999 and are Class Class B.