On average, listings lease in the $20's per square foot per year. The Carmel submarket is going through a decline in rates. In the last 3 months, the median rate fell $3 per sqft per year. That's a 12% decrease in rent.
In the last 90 days, 32 listings have come on the market, which means office spaces are probably going fast. You'll want to be prepared to make an offer immediately. About 3% of the available space in the Carmel are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 2,020 sqft. Most buildings in this region are close to 2 stories. Most buildings in this area were built in 1984 and are Class A.