An Eichler can look original from the street while carrying decades of hidden floor-plan drift. This Property Nerd field guide explains how to read roof seams, interrupted beam grids, enclosed atriums, expanded bedroom wings and converted garages—then map those changes with a 20-point Model-Drift Score and a separate documentation-confidence grade.

Excerpt: An Eichler buyer experiences the home as a sequence of views rather than a collection of rooms. The Property Nerds® Sightline Audit examines visual depth from the front door, atrium, kitchen and glass wall to reveal how furniture, landscaping, fencing and clutter can strengthen—or compress—the architecture.