The typical asking rate per listing is in the $20's per square foot per year. The King of Prussia submarket is going through a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 15% decrease in rent.
In the last 90 days, 29 listings have been posted online, which means spaces are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About 7% of the available leases in the King of Prussia are subleases, so you will probably have to focus your search on direct office leases. There aren't many listings below 2,000 square feet posted, so finding a space for a small business might be tough.
Even though the median size is 4,400 sqft, there are still 0 spaces below 2,000 sqft. Most buildings in this region are around 3 stories. Most buildings in this market were built in 1978 and are Class A.