The typical asking rate per listing is in the $20's per square foot per year. The St. George submarket is going through a a boost in rates. In the last 3 months, the median rate increased $10 per sqft per year. That's a 76% increase in rent.
In the last 90 days, 33 listings have been posted online, which means spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 70% of the listings in the St. George 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 on the market, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around 1,440 sqft. Most buildings in this market are around 2 stories. Most buildings in this market were built in 1997 and are Class B.