On average, listings lease in the $50's per square foot per year. The Aventura submarket is going through a a rise in rates. In the last 3 months, the median rate went up $15 per sqft per year. That's a 33% increase in rent.
Compared to the rest of the Gold Coast market, the Aventura submarket has higher rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 10 listings have been listed, which means new availabilities are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 10% of the available space in the Aventura are subleases, so you will probably have to consider a longer term lease. 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 2,100 sqft. Most properties in this area are approximately 9 stories. Most buildings in this market were built in 1988 and are Class A.