Most listings are in the $10's per square foot per year. The Springdale region is going through a an increase in rates. In the last 3 months, the median rate rose $4 per sqft per year. That's a 24% rise in rent.
In the last 90 days, 13 listings have been posted online, which means listings most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 100% of the available leases in the Springdale are subleases, so you might be able to find a shorter term or below market rent. 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 2,100 sqft. Most properties in this market are around 1 stories. Most buildings in this area were built in 1995 and are Class B.