So yes, some can convey some or all of it, I did, but it's NOT owed, ever, and means nothing if they don't, it's GC's choice, they earned it. 

Could be anything from someone leaving a faucet on, bad ring on a faucet to a leak or all the copper was cut out.

Do an LLC with each or all of them. 

They could put some or all of that money into private real estate deals - like syndications - and make 14-20% Average Annual Returns. 

Payments that you make normally fall into one of 3 buckets100% of the payment can be factored in somewhere on the returnPartial payment can be factored somewhere on the return0% of the payment can be factored in somewhere on the returnHouse-hacking also has considerable tax implications in the event that you want to sell this property.You can potentially defer a portion or all of the gain on the investment property with 1031 exclusion.You can potentially exclude a portion or all of the gain on the personal residence with section 121 exclusion.

another option for 2 family duplex is working with a prefab company. they go up fast and you can often buy in to do some or all the finish work depending on timeline and skills.

So a buyer that qualifies for a conventional or all cash etc has stronger odds of making it to the closing table.It just speaks to the strength of the offer.

If you somehow extract some or all of that equity, why not just focus on the most profitable buy & hold real estate you can find?  

I don't totally subscribe to his arguments but you can't go wrong listening to him because he brings up excellent points that are missed by many new investors who do not figure in those things until they get hit with $10k in roof repairs or $5k for HVAC repairs or even $1k for hot water heaters, or all of it.

I have read that it may be possible to show records of the sale and the on-time payments in order to get some or all of the debt payment excluded.