Most listings are in the $20's per square foot per year. The Kenai Peninsula Borough submarket is going through a an increase in rates. In the last 3 months, the median rate increased $28 per sqft per year.
In the last 90 days, 10 listings have been made available, which means leases are probably going fast. You'll want to be prepared to make an offer immediately. About 210% of the listings in the Kenai Peninsula Borough 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 870 sqft. Most buildings in this market were built in 1993 and are Class A.