There was a recent post here on BP where the person lost all their money in several deals and would not call out the sponsor.

Rent Roll13. property survey14. prelim title report (your broker can help with that)I DO NOT Ask or recommend my clients ask for tax returns, credit reports, bank statements - These fall into financial privacy protections and if my buyer walks from the deal, there is too much liability & risk with having that information if were to be leaked.If a third party management company has been managing it, you'll get basic information (income/expense, rent roll & leases, maintenance records, capex (maybe if they oversaw)).Owner operated properties will have less of this information as most mom/pop operators don't keep good records, in my experience.Don't worry about all this BEFORE the offer. 

It’s either that or to live with it.A side note: it might be that the owner is a slumlord, not because he/she is an evil person, but is simply a good intentioned person who doesn’t know what he’s doing.

HiCan I as the administrator of the deceased estate use a PO Box for the administrator address and not my personal address?

I do that personally...and my employer does it as well. 

I am aware that NJ has a personal occupancy provision in which the landlord gives at least 2 months written notice stating that the owner would like to occupy the downstairs unit once the tenants lease expires.

I also own a personal vacation home in the Poconos.

So I bought this house for me as personal residence & did live there the 1st year.

And we've done it with the stock market almost fully recovered back near ATH's, the housing market staying strong despite huge changes to interest rates, etc.Maybe it's all a mirage and one last hurrah to hold on before the big crash everyone has been anticipating finally does come, and I've been a bit of a doom and gloomer myself, but I think if you'd asked a year ago if it were possible to get back to 3% inflation in a year with the stock market within 5% of all-time highs and housing prices still within 5% of the peak every single person would have said it was impossible. 

You need to look at your personal risk/reward factor.