In need of major repairs and is not suitable for living due to some fixing that are safety issues but has potential?

You'll need to check with your municipalitySome additional food for thought:Lot splits in my area take a lot of time, patience and moneyYou can finance the construction of an owner-occupied 2-4 units with an FHA loan for as little as 3.5% down but the requirements are kind of onerous. 

My background is in ecological design, which you can find out more about in my profile, but in short it means I design and help create abundant edible landscapes that not only grow healthy food, but also enhance the ecology by purifying water, providing habitat for wildlife, and actually sequestering Carbon dioxide from the atmosphere in soil and plants.I have much gratitude to the creators of this space for creating something that is truly inspiring and brings people together.  

@Jim GoebelThank you very much for sharing your perspective, your thoughts are very useful for me, I have a little break from managing everyday issues, so I was thinking to make some decisions on who is responsible for  working fire detectors, what company to hire to check detectors and other safety issues, I am going to sign an addendum/reminder that people would not use basements as a bedroom if there are no 2 exits. 

I'm not going to name specific markets but there are a LOT of cities throughout the US within geographic boundaries that are often very close to each other, that have extreme disparities in income, educational attainment, safety, etc. 

We couldn’t have holes in walls or floors, had to have running water, and a few other “safety and security” issues that I can’t recall right now.  

Unless there is a safety issue, I wouldn't touch the bathroom until the unit is vacant.

One year we discovered that mice were in our "private" closet, eating boxed and bagged food, while nesting in some towels. 

It would be the landlords responsibility however since it is the ceiling unless their is a safety issue he would not be required to repair it.

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