Most listings are in the $0's per square foot per year. The Kauai County submarket is experiencing a decline in rates. In the last 3 months, the median rate decreased $32 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 4 listings have been listed, which means listings most likley are going fast. You'll want to be prepared to make an offer immediately. 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 sqft. Most buildings in this region were built in 1987 and are Class A.