I've never had a problem with having a section 8 tenant pay their portion (as you may know if they do not pay they lose their voucher).

The fact that you will choose to forgo the market rent and live in the bottom portion is your choice.  

@Jeremy Paschedag I have heard of exceptions granted by the IRS for an IRA owner to purchase a property from their IRA.You may also take portions of the property each year.

Many crowdfunding portals already perform a portion of this due diligence when they list an offering.

We did receive a settlement from the city for lack of use and access to that portion of our property but we still need to maintain it, we can access it by a stairway but for larger items we have walked our mower, over the corner of the neighbors lot. 

Although I'm not in Texas, my understanding is that the state portion of sales/service tax is 6.25% and then some municipalities slap another percent or two on top of that.

You should speak with your CPA on this matter.The basic premise is that the portion of the income derived from the non-IRA capital is taxable.Here is an example:$100K property$40K down payment, $60K mortgage.  

However recognising that some landlords have terrible business practices and struggle psychologically with the responsibility of efficient tenant turn over it is conceivable they see a benefit in paying a portion of their tenants rent.  

When you get closer to retirement and at the point of needing a stable income there would be a place for it for the portion of your portfolio.Truly self-directed Solo 401k plan would give you most flexibility and control.

If someone qualifies for the income and landlord reference portions, I have a program for bad credit applications that allows me to rent to them.