I am a licensed real estate broker in Texas. NJ can be a different game, but gov`ts being what they are, the results are usually the same. When all the levels of gov`t get involved plus your local tree huggers, RUN away from the property. Even with assurances from different bureaucracies, don`t try to make it work if you need to get things accomplished soon.
One option you may consider, get the current owner to build your facilities for you, then purchase the finished location. The monkey is on their back to get it built, deal with the regs, etc. Your contract would stipulate that they have to get everything done in a set time-frame or the contract is void.
A second option would be to enlist the "help" of the local environmental groups and get them to suggest how to implement your idea on the land that will help to preserve the wetlands, accomplish your business objectives, generate community good will, positive PR, an immediate customer base to help you get the word out, and even financial assistance in completing your project. This option will take quite a bit of coordinating, time and energy. It may be worth the time/risk, but be prepared to walk away from the deal if it goes side-ways.
If the land is a "good deal" relative to surrounding similar properties, check it out thoroughly, there is always a reason for low pricing.
Good luck, let us know what you decide and the progress if it does.