The Most Important Thing
Marks's memo on "second-level thinking" is the lens I use every time I get excited about a pocket listing — the question isn't whether it's a good asset, it's whether the price reflects what everyone else already knows about it. His chapter on risk as something felt rather than measured changed how I think about the unseen liability in a deferred-maintenance hillside. I've given this to three buyers who thought they were getting a deal on a Bel Air pocket and needed to understand what "priced for perfection" actually means. Read the memos too; the book is the distillation but the originals have the texture.
Mental models