While I agree that the landlord could potentially be on the hook for these things, I also feel like these issues can easily be addressed within the terms of our agreement.

Where do I start if I know the home address?

Or can I just change my mailing address and pay OR state taxes? 

The code also addresses light and ventilation.  

If you're thinking of selling it, please give me a call at (937) 458-3303.SheriEmail address

One unit's front door faces east, while the other front door faces south, so the two units have different street addresses.

@Kaira Resch The lease should address this types of situations, meaning that the rent is abated at the time the tenant can not occupy the property, meaning they could use their rent to pay for elsewhere to reside during this time. 

So, over the past year I’ve been using a proprietary software that allows me to collect data of commercial property owner: Name, cell and home phone number, email address, home address.

May be a good idea to go to your city/ county permit office and have them run the address to see if there are any updates that they are tracking you may need to make as well as the timeframe you will be expected to.

I know 3 addresses where the people are deceased and after speaking with neighbors know they have no kin.