20 Sunnyside Ave — Sale in Mill Valley, CA

  • Price: $5.2M
  • Listing type: For sale
  • Asset type: Office
  • Location: Mill Valley, CA 94941
  • Size: 7,300 SF

Photos

20 Sunnyside Ave — Sale in Mill Valley, CA, photo 1 of 1

Investment Figures

Price per square foot
$712

Derived from the asking price and operating figures published for this listing. Informational only — not an appraisal, valuation or financial advice. Verify independently before relying on any figure.

Market Context

This office in Mill Valley, CA is listed for sale at $5,199,000 across 7,300 SF ($712/SF). Compare it against other office listings for sale in Mill Valley, CA — view the full market.

As of Q2 2026, the San Francisco office market showed a 26.8% vacancy rate, average asking rents near $71.41/SF/yr, and rents up 1.0% year over year. Source: multiple brokerage reports, Q2 2026.

Rising rents point to a competitive market where well-priced, well-located assets trade quickly.

Office market FAQ

Is the San Francisco office market tightening or softening?
Vacancy is around 26.8%, with asking rents rising year over year (Q2 2026).

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