Diligence · Glossary
Proposition 13 Basis
Updated 2026-07-20
Proposition 13 limits assessed-value growth until change in ownership or new construction. Purchase price often resets assessed value.
What it means
Proposition 13 limits assessed-value growth until change in ownership or new construction. Purchase price often resets assessed value.
Why it matters for land decisions
Confirm how the concept applies to your specific parcel with the city or county planning department and the controlling agency map or ordinance.
- Treat online GIS as a first-pass screen.
- Verify before design, escrow, or lending decisions.
People also ask
What is Proposition 13 Basis?
Proposition 13 limits assessed-value growth until change in ownership or new construction. Purchase price often resets assessed value.
Is a GIS overlay enough to decide?
No. Public GIS is a screening tool. Official determinations come from the governing agency, recorded documents, and licensed professionals when required.
Official sources
Related terms
Check this on a California parcel
Parcel View screens zoning, flood, fire, soils, and planning layers for any California lot — every finding linked to the official source.