I’m trying to add my kid so he can build credit early but can’t find a card he can piggyback with me that will actually report to credit agencies

I would suggest trying for a single family, your demographic of renters are better, values rise faster and you will have a more diverse renter pool. 

The home office deduction is a popular deduction that people try and be aggressive with but in my experience it is extremely difficult for people to qualify for when everything is done by the book.

I’ll give this a try as well. 

The vast majority of buyers are not actually buyers at all...they're assignors, meaning they will tie you up in a contract and then try to flip the contract to another investor who actually does buy properties.

I try not to do referrals in the forums due to the fact that these messages live on in perpetuity, and who I am recommending today might be completely different than who I am recommending a year or two down the road.

Or, if we should try to rent it out.

I tried to owner finance it, but I didn’t have any takers. 

have you been turn down when trying to buy a house

I think that is exactly what we will do after I reach out to them one more time to try to get them to see it from our perspective.