That being said, I wonder if the tenant would be able to apply for SSI based on the change in income and living circumstances?   

Motivation is an emotional response to a circumstance.

I recognize what you presented was a hypothetical but the answer is going to be dependent on the individual and their personal circumstances. 

Changes in life circumstances necessitated the move.

Taking advantage of people in foreclosure can be equity skimming and equity stripping, depending on the circumstances.

And our lease is an ever changing document as laws change or circumstances dictate. 

Turning a large room into a bedroom and closet can add value depending on circumstances.

Orignally purchased as a rental, but some unforseen circumstances have caused us to pivot to fix/flip model on this property.

Quote from @Matt McCurdy: @Kayla Elliott it is a great question and it's something that each investor has to decide on their own and their circumstance. 

@Justin Brin Yes, you can elect to aggregate your rental properties for Qualified Business Income (QBI) purposes, but once you do, you must continue to aggregate those same properties in future years unless there is a significant change in circumstances (such as disposing of a property).