@Brad Haughton I'm not your shoes but come on it's 2020.

If I were in your shoes, I would immediately meet several trusted contractors on site to check the roof for leaks, siding/bricks for leaks and to make sure water intrusion is stopped immediately.

She’s also saying that Mobile Home has an un-permitted addition this extra room is a covered porch turn into storage space which is allowed.

Solar has also become more viable lately due to technology advancements in power storage.

Most Koreans I know are incredibly clean domestically- they don't wear shoes in the house.

Meaning that if the SFH was permitted as 1,000 sq ft, but 500 additional sq ft have been added on unpermitted, your appraised value will be based on the 1,000 sq ft and the extra 500 will be considered storage area and not living area.

As the owner of the house, it ends up being my problem and I've paid it.I'm wondering what you would do if you were in my shoes. 

You'll find that a lot of Midwesterners just use their garage for storage of seasonal stuff, so it's not necessarily a huge draw or deterrent to have one vs not. :)The only time it might be an issue is if yours is the ONLY property without a garage.

Examples of master lease agreement tenants include: storage rentals, short term vacation rentals, and stand alone retail stores( Walgreens,CVS,Dollar General,etc).You should be able to achieve a 10% net return before leverage with short term vacation rentals.Find a manager that is building new properties to minimize exterior maintenance for next 20 years.

A small 1 car garage(only 1 tenant actually uses it, cannot open car doors easily), laundry/storage room, and a "bonus" room right when you walk into the units is on the first floor.If there is any more information that you need, let me know.