, but typically, the new owner's basis is established at the date of death.

I mean, is there a doggy death certificate out there?

As you can imagine baby duty has taken a toll on my free time, however I still owe you drinks!

It's the bunch of little fixes/upgrades coming due, i.e. death by a hundred papercuts that I'm talking about.  

With assistance of counsel, if you and the tenant agree to terminate the lease, get an ironclad mutual release that protects you from lawsuits.   5 years from now when an in-grown toenail leads to a death (at least that will be their logic) because of complications related to the "mold factory" you leased to them they will come looking for you. 

Then on your death bed you can say " I Died A Wealthy Man BUT I just can't put a Dollar Value to It  "

My property management contract contains a "Hold Harmless" clause which provides as follows: "Owner agrees to indemnify, defend, and save Agent harmless from all suits in connection with the leasing and managing of the Property and from liability for damage to any other Property and for injuries to or death of any person or person."

Mortgage money is so cheap now that equity is dying a slow painful death sitting dead in a property and hurting your returns. 

How can I obtain an official death record to confirm that there was indeed the death inside the unit in order for me to inform the new tenant and accused the seller?

Return will be far greater and expenses, unlike 300 individual homes, will not nickel and dime you to death.