The typical asking rate per listing is in the $20's per square foot per year. The North Miami submarket is going through a decrease in rates. In the last 3 months, the median rate decreased $16 per sqft per year. That's a 38% decline in rent.
Compared to the rest of the Gold Coast market, the North Miami submarket has lower rates, so you should have no trouble finding a great deal in this depreciated submarket.
In the last 90 days, 7 listings have come on the market, which means new availabilities are probably going fast. 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 area are close to 2 stories. Most buildings in this area were built in 1969 and are Class B.