On average, listings lease in the $30's per square foot per year. The Kauai County region is seeing a an increase in rates. In the last 3 months, the median rate went up $6 per sqft per year. That's a 21% rise in rent.
In the last 90 days, 5 listings have been posted online, which means new availabilities most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 2,230 sqft. Most buildings in this area were built in 1987 and are Class A.