Most listings are in the $20's per square foot per year. The Fountain Hills submarket is going through a a boost in rates. In the last 3 months, the median rate went up $3 per sqft per year. That's a 14% rise in rent.
Compared to the rest of the Phoenix Metropolitan Area market, the Fountain Hills submarket has greater rates, and you'll have to negotiate above asking rent to be in this hot submarket.
In the last 90 days, 9 listings have come on the market, which means listings most likley are leasing quickly. 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 2,410 sqft. Most buildings in this market are close to 2 floors. Most buildings in this area were built in 1999 and are Class C.