Property research guides
Understand the record before you rely on it.
Practical, source-linked explanations for common public-property research tasks. These guides are educational—not title, legal, appraisal, surveying, permitting, or tax advice.
Guide 01
How to find a Los Angeles County AIN
What the 10-digit Assessor Identification Number does, where to locate it, and how to use it safely.
Read the guide →Guide 02
How to look up LA zoning
Use a parcel address as a starting point, then verify zoning, overlays, and permits with the right agency.
Read the guide →Guide 03
How to read an assessor record
Learn the difference between assessed value, parcel facts, building facts, ownership fields, and tax amounts.
Read the guide →Guide 04
Why a building address may resolve to another parcel address
How suite, tenant, mailing, and street addresses relate to the assessor’s primary parcel situs.
Read the guide →Guide 05
How to use permits in property research
What a building permit can tell you, what it cannot, and how to verify it with the responsible agency.
Read the guide →Source directory
Public property-data sources by city
Direct links to the agencies and public portals behind the property research process.
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