Most listings are in the $0's per square foot per year. The Riverdale region is experiencing a decrease in rates. In the last 3 months, the median rate fell $26 per sqft per year. That's a 100% decline in rent.
In the last 90 days, 0 listings have been posted online, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the available space in the Riverdale are subleases, so you will probably need to sign a longer term lease with the landlord directly. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
The standard measurement for office space in this area is around sqft. Most properties in this market are close to 4 stories. Most buildings in this region were built in 2006 and are Class B.