Well, somebody knows something. How do they know about breaking the lease and repaying the lessor? They know who the lessor is. Who is sending you an email and how do they know what the income/expenses are? I wouldn't do it if details of expenses were not furnished. If any "improvement" was made to the land, it needs to be depreciated. Somebody knows what it was because they paid for it. If "they" (whoever they are) stop paying the rent, believe me they will be contacted by the lessor who probably will produce a copy of the lease. They know who the management company is. They get a check, so they know the name of the issuer and the bank account it is drawn on. You would be surprised how much you can find out about these things on the internet. A copy of the will should be filed in the court of the county in which the original owner died, no matter how long ago. If it was a testamentary trust, that info about location of the farm is in it. And ownership of the farm would be recorded at the county for real estate tax purposes. Somebody is paying them. Somebody is paying to do the tax return. Who? I don't buy the theory that "nobody knows anything." This is the sort of stuff I would love to get into and it looks like everybody now has the time to do it. It doesn't seem like you have enough information to sign off on this and I would certainly convey that to whoever the current trustee is.