Most listings are in the $10's per square foot per year. The Spanish Fork region is going through a a rise in rates. In the last 3 months, the median rate went up $20 per sqft per year.
In the last 90 days, 4 listings have been posted online, which means office spaces most likley are going fast. You'll want to be prepared to make an offer immediately. About 50% of the listings in the Spanish Fork are subleases, so you might be able to find a shorter term or below market rent. 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 960 sqft. Most buildings in this area were built in 1996 and are Class A.