Most listings are in the $20's per square foot per year. The Delray Beach submarket is going through a a rise in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 14% rise in rent.
Compared to the rest of the Gold Coast market, the Delray Beach region has lower rates, so you should have no trouble finding a great deal in this depreciated region.
In the last 90 days, 31 listings have been listed, which means leases 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 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 2,010 sqft. Most buildings in this region are close to 2 stories. Most buildings in this market were built in 1987 and are Class B.