On average, listings lease in the $30's per square foot per year. The Greenacres submarket is going through a a boost in rates. In the last 3 months, the median rate rose $30 per sqft per year.
Compared to the rest of the Gold Coast market, the Greenacres region has smaller rates, so you should have no trouble finding a great deal in this discounted submarket.
In the last 90 days, 2 listings have come on the market, which means leases most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. About 150% of the listings in the Greenacres are subleases, so you might be able to snag a great spot on a short term. 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 650 sqft. Most properties in this area are close to 2 floors. Most buildings in this area were built in 1986 and are Class B.