The typical asking rate per listing is in the $0's per square foot per year. The Felton region is experiencing a decrease in rates. In the last 3 months, the median rate fell $16 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 are probably going fast. You'll want to be prepared to tour spaces as quick as possible. About NaN% of the listings in the Felton 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.
The standard measurement for office space in this area is around sqft.