Most listings are in the $20's per square foot per year. The Jupiter region is going through a an increase in rates. In the last 3 months, the median rate went up $2 per sqft per year. That's a 7% rise in rent.
Compared to the rest of the Gold Coast market, the Jupiter submarket has smaller rates, so you should have no trouble finding a great deal in this discounted region.
In the last 90 days, 17 listings have been listed, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 6% of the listings in the Jupiter are subleases, so you will probably need to sign a longer term lease with the landlord directly. 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 1,360 sqft. Most properties in this market are around 1 stories. Most buildings in this region were built in 2003 and are Class A.