There is lack of properly zoned land for these ventures, and when you find it... it is expensive as hell.

As far as 'showing me the other offers', which the meeting was meant to be for, he waived some pieces of paper around in my face and didn't even let me look at them properly.

If they don't, go ahead and do it anyway and raise the rent with proper notice at lease renewal time.

You need to ensure that your tenant-buyer can actually perform, they may not take the option but taking their money when they have no hope of meeting the terms can backfire on you as predatory dealing. 

Ensure to pick the platform according to your business needs.

Since you are planning on selling to a low income family you may get the attention of the CFPB if that family stops paying on the note down the road and claims you didn't qualify them properly.

I'm about to refinance our 8th and 9th BRRRR house next week and ensure I don't go over $45K if the rents are $900/mo

Many of these operators have no IT system whatsoever as they are keeping written records and they have a number of reminder safeguards in place as part of their written policies and procedures to make sure that their customer’s NPI is properly protected.

The proper guidance and education is. 

Just make sure stained concrete is properly sealed. 2.