If you do not, and she stays but fails to pay rent, you have to proceed with giving proper notice to pay, failure of which entitles you to file an eviction.

Both units were separately metered with all mechanicals in working order, making it an ideal property for investors.

Failure to descale will void warranty and significantly shorten the tankless water heater’s life    Good luck

The card has less mechanical fixes, but more usage fixes and costs more, but I think does better long-term since they can load the amount they want.I also agree with @Luan Oliveira in that the best thing that you can do in any small multi is to set laundry days in advance, every other day.

What mechanism would be driving such "cycles"? 

By telling everyone to wholesale to become an investor, you are just pushing them down a path of projected failure."

How do I avoid a mechanics lien on a future property?

This is because it was poorly converted, improperly done, "patched up" over time, and might have mixed up mechanicals etc.

He was born in kidney failure and later we discovered he has liver cancer.

A tenant may only be evicted on this basis if the property is being demolished or if renovations will a) substantially modify or replace a structural, plumbing, electrical, or mechanical system, and require permits, or b) remove unsafe materials, such as lead paint, mold, or asbestos, from the unit.