Most listings are in the $0's per square foot per year. The Felton region is seeing 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 come on the market, which means new availabilities might be leasing quickly. You'll want to be prepared to make an offer immediately. About NaN% of the office spaces 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.