

You want to know what’s unethical? Planning and allowing someone close enough to receive an inheritance wait for you to die before you provide them housing. Hopefully I am off base here, but it sounds like they could set you up with this situation now.
It sounds pretty shitty for a landlord to charge enough to support the remainder of their life with the rental of only half of a house, and it sounds like that is the intended plan for you. Just don’t charge so much as to be taking advantage of those without the privilege of inheritance, and you may even be providing value to the renters, as other comments have suggested. Feel good about that.
I’m heading far into the future - say 1000 years or perhaps 100 if communication would be an issue. I’m going to grab all sorts of portable devices and tools to take back with me, and I will maintain the remainder of my life without sharing my goodies. The world is screwed because they get no fruits of my intense labor, but that is fine since I hate them anyway. For that afternoon of work, I get to live a great life while everyone else must suffer in modernity.