The typical asking rate per listing is in the $20's per square foot per year. The King of Prussia region is experiencing a decrease in rates. In the last 3 months, the median rate fell $5 per sqft per year. That's a 15% decline in rent.
In the last 90 days, 35 listings have been listed, which means spaces are probably leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 6% of the listings in the King of Prussia are subleases, so you will probably need to consider the implications of signing a direct lease with the building. 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 3,090 sqft, there are still 0 office spaces below 2,000 sqft. Most properties in this market are close to 3 stories. Most buildings in this market were built in 1978 and are Class A.