They will not live indefinitely as dying is a reality for us all.  

I can afford to run it as an MTR indefinitely even with the negative cash flow (our PITI on this unit is ~$4k).  

Tax dollars insure nuclear plants, clean up disasters and also store the waste indefinitely. 43% of coal is mined on public lands, then it is shipped on railways built with tax dollars and burned in power plants built with tax dollars.

This verdict will be appealed indefinitely but will ultimately stand.

Example: page load errors, mobile app freezes mandating a force-quit and relaunch, and increasingly templated customer support responses about putting feature requests or basic service issues on an indefinite development timeline.

And by doing the 1031 process you get to indefinitely defer paying the tax on the gain. 

Also, separate question, if I want to keep them on as month-to-month indefinitely (since so long as rents are below market and their presence makes it hard for me to improve the apartments a year-long lease seems more to their advantage than mine) do I establish a "month-to-month lease" with them that would stipulate when rent is due and what happens at what date when you don't pay, what their responsibilities and mine are, where people can park, etc.?

In definitely going to be looking at this!!

We plan to hold indefinitely, but there is always a chance we sell.7.

The last home I purchased with a tenant inside still, we started the process, but it didn’t have to come to an actual eviction, they eventually moved out...but that certainly doesn’t mean the tenants just have the right to live in the house indefinitely without any sort of eviction.