Would I take someone on government assistance or disability unlikely,because they don't fit my screening process,nothing to do with who they are. 

Unless the new owner is disabled then this can be bypassed.Option #3 - Tenant buyout.

Rent controls or other local laws and ordinances are just that, Local, and you need to review the enabling authority for specifics.As a PM, I routinely run background checks on all applicants, and our policy is that not only will we not rent to someone with felony arrests, we will not rent to any violent offenders, drug offenders, sex offenders, GTA or petty thieves either!

The Fair Housing Act The Fair Housing Act (the Act) prohibits discrimination because of race, color, religion, sex, national origin, disability, and\ familial status in most housing related transactions.

Many of these groups manage both affordable and market rate however have a great deal of experience screening tenants and conducting routine unit inspections which it sounds like is a major issue with your existing company.

I routinely tell even married couples not to buy investment properties together (example from 10 seconds ago).

Or, a charging order may be granted.If you're going the umbrella insurance route, perhaps see if it will cover you for several things including just the routine slip and fall (like mold or earthquake).

To summarize this long post, it is a fair housing violation for landlords to actually be conscious of the source of income type when making a decision to rent a property but once it is rented, we better recognize immediately that the tenant is disabled so we can make a reasonable accommodation to let him/her break the lease with zero notice or it is a fair housing violation.

Mother is partially disabled so would like to stay near her in the meantime. 

If a routine maintenance list was in place, this would have been avoided.