The typical asking rate per listing is in the $20's per square foot per year. The Trenton region is going through a a boost in rates. In the last 3 months, the median rate rose $25 per sqft per year.
In the last 90 days, 17 listings have been made available, which means spaces most likley are leasing quickly. You'll want to be prepared to tour spaces as quick as possible. About 12% of the office spaces in the Trenton are subleases, so you might be able to sign a shorter term by taking over a previous lease. There aren't many listings below 2,000 square feet on the market, so finding a space for a small business might be tough.
Even though the median size is 12,000 sqft, there are still 0 office spaces below 2,000 sqft. Most buildings in this market are around 3 floors. Most buildings in this market were built in 1953 and are Class A.