Trust & Methodology Center
How we aggregate, verify, and publish market intelligence for California's most exclusive zip code.
1. Primary Source Aggregation
We strictly utilize primary, verifiable sources for all quantitative data. This includes the San Mateo County Assessor's Office, the Town of Atherton Building Department, and direct MLS API feeds. We do not rely on third-party estimates or unverified algorithmic valuations (AVMs).
2. Off-Market Verification
"Whisper" listings and off-market transactions are cross-referenced with recorded grant deeds and public trust documents within 48 hours of closing to ensure historical pricing accuracy.
3. Editorial Independence
Atherton Homes operates with strict editorial independence. Our market analysis, builder directory, and architectural reviews are not "pay-to-play." Firms cannot purchase placements within our core advisory datasets.
Data Partners & Integrations
- San Mateo County Clerk Direct Feed
- Town of Atherton Portal Permit Data
- California MLS Matrix Live Sync
- CoreLogic Historical Data