The candelabra usage at Butch's pad means the lights have been out for a longer period of time than indicated. When the electricity is just out for a few hours most people have enough batteries to run flashlights for illumination, one usually doesn't resort to candles until after several days because that's usually when batteries become too expensive to continue to replace. The fact that they even had a candelabra and candles in that hell hole in the first place probably means the electricity being shut off is a regular occurrence.
I noticed Tyler's sister had enough money to buy her cigarettes and probably still has a phone too, sure, it sucks to see her kids with no electricity but that was her and Butch's choice and not up to Tyler to fix. My in laws did that constantly, they spent their money on addictions and entertainment first and left electricity, housing and other important bills for last because they knew they could whine to family about their children being in need of essentials.
Regarding the Trust Deed Assignment of Rents thing, a friend of mine had some holiday property that he was going to offer to a family friend of his using this method. He explained that his friend was young and kind of a flake and wouldn't have been able to qualify for a traditional mortgage on his own for the house and said it would have been kind of like a rent to own situation for family friend and he would still retain ownership and be protected if friend defaulted.
Obviously not everyone has the same reasons for such a contract, but in the context of Andrew's family's home I'm thinking it might have been a family owned home that was offered to his parents by one of their parents (or whoever owned it) via this rent to own method when they were younger and unable to qualify for the mortgage themselves.