The Ten Most Expensive Homes Sold in Marin County in 2025

So What About Off-Market Sales Not Reported in MLS?

Every year, I publish this Top 10 using MLS-reported closed sales—because that’s the cleanest “apples-to-apples” dataset for tracking the market. But Marin’s true ultra-luxury segment has an important wrinkle: some of the biggest transfers happen off-market and are not reported in the Multiple Listing System (MLS).

It’s also important to distinguish between two different types of “off-market” activity:

• Off-market, later added to the MLS: Some private sales are never publicly marketed, but the closing is later entered into the MLS as a sold comparable (often by one of the parties involved). Those transactions can show up in an MLS-based Top 10 and are reported in my list.

• Off-market, not added to the MLS: Other private transactions are completed entirely outside MLS reporting and never appear there at all—yet they still become discoverable through public records (and sometimes reputable media coverage). Those transactions will not appear in an MLS-based Top 10 list, even if they are significant.

A great example occurred in Belvedere in late August 2025, when former Apple design chief Jony Ive was widely reported to have purchased four Belvedere Island homes for a combined $73 million, including one property reported at $43.5 million—a price point that would sit far above the #1 sale on this year’s MLS Top 10 list.

Reported off-market Belvedere purchases (publicly reported totals) — Addresses Redacted for Privacy Reasons

Locksley Hall (Blanding House), Golden Gate Avenue, Belvedere — $43,500,000
“Organ House,” Golden Gate Avenue, Belvedere — $14,620,000
Additional Golden Gate Avenue home, Belvedere — $6,900,000
Beach Road home on Belvedere Cove, Belvedere — $7,980,000

(Those four sales were reported together as a $73 million package deal.)

Why some buyers and sellers choose off-market in Marin

At the top end, off-market transactions often come down to privacy and control—fewer showings and less public visibility, greater discretion, reduced “days on market” signaling, access to properties not broadly marketed, and a faster, more tightly managed process when both sides are motivated.