Unfortunately, many landlords are hesitant to rent to these migrants due to their circumstances.Given our personal connection to this issue, my aunt and I believe we can make a positive impact by providing housing for these migrants.

Can I give a tenant written 30 day notice on June 1 (in person or taped to the door) for move-out on June 30? 

You're income certainly isn't "normal" and some banks might shy away but this is a personal business and if you have a track record, I think you can find a bank to say yes.

I used my personal cash for both , but I’m looking to purchase more with lending.

LLCs offer no tax benefits, they mitigate liability and the fact that this is on your personal property and you'd be renting to yourself, there's no liability to mitigate.

If you could go in person that helps. 

Becoming a landlord is more work than the average person thinks.

It has not been well maintained over the last 19 years with a string of just bad renters and the person I had managing it just didn't do good quality repairs or work to it. 

I don't see any reliable apps that focus on handling maintenance requests for small multifamily owners (2-4 units).

@Romane DaleyYou can't borrow from an IRA; the only way to access IRA funds for personal needs is to take a distribution, which would be taxable, and penalties on top for premature distributions.