This usually has to be a registered card as well (like a 888 or 800 #) to call at purchase to comply with National Anti Money Laundering laws.

He gave us two options: Move the mobile homes out (which is practically impossible we have families living there) or comply with these requirements and do a petition to change the zoning in the area.  

After you confirm, or take the necessary steps, so you can legally manage for others, the lease should identify the owner of the property as the "landlord" and you as the "agent" for that landlord.You should also make sure to check your state and local requirements for the lease, to make sure it complies.

I would suggest you would have an addendum stating how to properly live with this type of pump and failure to comply will result in tenant charges to repair or replace accordingly

How are you complying with the new law?

In order to apply for these exceptions, units within a condominium, cooperative, or mutual housing corporation, the association must submit a detailed written and graphic report indicating that the unit’s required fire separation walls fully comply with N.J.A.C. § 5:10-1.4(b)4.

You will draft/sign an assignment of PA with your end buyer, just as the PA find a template online and ask your attorney to review it to make sure it complies to local laws.

that the main concerns would be structurally- assuring this is indeed a fully functioning third unit  that complies with any local zoning that would possibly apply. 

Failure to have a forwarding address is no longer a barrier to comply with the statute. 

This is a popular question here, @Sanjiv Mehta so you might do a search.The usual responses are to never pay up-front fees, make sure your lender is appropriately licensed in the state of the loan, and complies with all usury restrictions.