The Eichler record becomes considerably more interesting once you move beyond the tract name and start looking at the individual plans. Across California, surviving Eichler homes can be distinguished by original model numbers, plan revisions, roof structures, atrium configurations, gallery layouts, and other architectural details that are often invisible in a conventional real estate listing. Six Sunnyvale neighborhoods — Fairbrae, Parmer Place, Fairorchard, Rancho Sans Souci, Midtown, and Rancho Verde — illustrate why model-level documentation matters when researching the surviving Eichler inventory.

Why Model Numbers Matter

For researchers, the model number is effectively part of the Eichler cipher. In these Sunnyvale neighborhoods, the record includes an unusually broad sequence of plans and revisions, including O-4, O-4R, O-103, O-103R, O-104, O-104R, O-105, O-105R, O-114, O-114R, O-115, O-115R, O-123, O-123R, O-124, O-124R, O-134, O-134R, O-144, and O-144R, alongside SV-94, SV-94R, and SV-1544. Those designations are not interchangeable. The R variants and differences between related model numbers are part of the historical record, helping researchers identify how Eichler's plans evolved and how a particular surviving house relates to the original architectural program.

That distinction becomes especially useful when looking at double A-frame Eichlers. The roof structure is one of the quickest ways to recognize that a house may belong to a particular family of plans, but the roof alone does not tell the entire story. The relationship between the double A-frame, atrium, interior gallery, bedroom wing, living spaces, and garage configuration can help connect what exists today to an original model designation. A house that appears broadly similar to another Eichler from the street can therefore represent a different plan, revision, or architectural configuration once the original drawings are compared.

Gallery Models and What the MLS Misses

The same is true of gallery models. Gallery configurations can be easy to overlook in a conventional property search because MLS photography tends to emphasize finishes, renovations, kitchens, and staging rather than the underlying geometry of the original Eichler plan. For the Vault, the original floor plan is often more revealing. It can establish the relationship between the major rooms, the atrium or courtyard, circulation paths, roof structure, and later modifications in a way that a contemporary listing cannot.

This is one reason Eichlers can trade off market without leaving a complete public architectural record behind. Some owners have held their houses for decades. Others find buyers through personal relationships, neighborhood networks, architectural communities, or direct introductions. When a transaction occurs without a conventional MLS campaign, the market may record the transfer while losing important information about the house itself — particularly if the property is subsequently remodeled.

The Six Sunnyvale Tracts

The Eichler Vault approaches that problem from the architectural side. Members of the Vault community contribute original floor plans, tract plans, photographs, historical material, and other documentation that can help identify and verify individual homes. Those contributions are then useful for comparing model numbers, recognizing variations, tracking unusual configurations, and understanding how the surviving inventory relates to the original Eichler development record.

The Eichler Vault community portal extends that process across California. Homeowners and researchers can contribute material and download rare original floor plans and tract documentation covering Eichler neighborhoods from Marin County and San Marin to the South Bay, East Bay, Peninsula, and Thousand Oaks. The result is a living architectural record that can be updated when an original drawing surfaces, a homeowner identifies a previously undocumented variation, or an individual house provides new evidence about a particular model family.