Most IRA custodians who accept single member LLCs as IRA investments will require that you appoint some kind of special advisor (licensed CPA or attorney) who will review all the transactions of the LLC to make sure there are not any prohibited transactions happening.

It is hard to know for sure from your description how bad it is, so this could be cost prohibitive.

Illegal activities can still be prohibited in a lease.  

I was going to help my son invest 10k in an SDIRA and the fees made it prohibitive with a small amount.  

@Gina CresseTo learn about the prohibited transaction rules visit the following:https://www.irs.gov/Retirement-Plans/Plan-Particip....

Trying to meet them in person will be prohibitive.

IRS rules prohibit any direct or indirect provision of benefit, goods, or services, between the plan and a disqualified party - in either direction.  

As long as you do that (allow them the ability to have them installed, and don't "prohibit" the modification) then you have made a reasonable accommodation and are ok as far as the ADA/fair housing goes.Obviously you really should read the appropriate portion of the act yourself, and if you have any doubts or questions seek appropriate legal counsel.

The day after the 3 day expires a young man contacts me, who has been one of her illegal subletters, subletting is prohibited in her lease.

Also, they will prohibit assignments.