In the last 90 days, 4 listings have been made available, which means new listings most likley are going fast. You'll want to be prepared to tour spaces as quick as possible. 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 sqft. Most buildings in this region are close to 21 floors. Most buildings in this area were built in 1927 and are Class A.
Not much of the real estate is used for commercial space, so it might be hard to find office space. Waste services is the dominant industry in this market. Most of the folk of Rittenhouse Square work from home. Commuting approximately 15 minutes a day is the norm for those who opt to reside in this part of town.