Here's another huge woodland mansion in this survival Minecraft seed. It is located up north from the spawn point at 548 79 -749. It has this unbelievable thick foundation that makes up the entire ground floor.
At the following coordinates 587 85 -861 you will spot a hidden chest with a golden apple inside.
Also, don't forget to check a small village at 782 65 -438 with a smithy that keeps some obsidian in his chest.