In the last 90 days, 5 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to make an offer immediately. About 40% of the listings in the Riverside 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 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 region are close to 2 stories. Most buildings in this market were built in 1972 and are Class B.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Real estate is the dominant industry in this market. Commute by motorcycle is the most popular way to get to work amongst Riverside folk. Commuting approximately 20 minutes a day is the norm for those who opt to reside in this part of town.