On average, listings lease in the $30's per square foot per year. The North Miami region is going through a an increase in rates. In the last 3 months, the median rate rose $3 per sqft per year. That's a 9% rise in rent.
Compared to the rest of the Gold Coast market, the North Miami region has more expensive rates, and you'll have to negotiate above asking rent to be in this hot region.
In the last 90 days, 13 listings have been made available, which means new availabilities are probably leasing quickly. 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 500 sqft. Most buildings in this market are approximately 2 stories. Most buildings in this market were built in 1969 and are Class C.