Do I sell it and so that I can collect my money?

There is also a sight concern of COVID-19 and not collecting rent right away, but I do not see that as a long term issue. 

40 years of credit and collection experience, 20 years of commercial land lording, 20 years of debt buying and I'm still not sure I know enough to start a fund. 

And let dad know that if he does not deliver an empty unit by April 30 that you will evict him and son because the lease is with him when evictions open, and you will collect the back rent, including the increased rental amount from whenever your notice allows, maybe June1?

If I purchase a tax certificate and the property isn't vacant, but has renters, am I entitled to collect the renters monthly payments from the house or apartment units until the owner redeems? 

It provides no assurances that landlords can collect rent, remove problem tenants, or get a fair hearing in the court system.

Typical due diligence jargon for multifamily properties includes: - T-12 (Trailing 12 months) Includes the last 12 months of operating expenses & typically any renovations they’ve done to the property - Rent Roll includes all current tenants, lease renewal dates, vacant units, rent owed for each unit, rent collected or not, security deposit info, etc. - OM (Offering Memorandum) The broker will have the OM only if the property is on the market.

Some very interesting data to share with you all on April rent collections across the US.

The easiest way is to assign it a collection agency. 

@Akeim Fin I haven't done it, though I've seen leases for only part of the year of course, especially in student situations.My thought is, sure you can try to put such fees in, but collecting on them if the tenants didn't pay those would be a different matter entirely.I think if you did this in an A or maybe B area, you might stand a chance of having people pay those fees, but I wouldn't count on them.And as you said, it's a legal question in general, and involves doing something in a lease which is uncommon, so I think it's one best posed to your attorney anyway.