Peter Cowperthwaite

Peter Cowperthwaite is a real estate agent with Golden Gate Sotheby's International Realty in Menlo Park. MLS records credit Peter with 10 transactions over the last 12 months, worth $65.5 million in total sales volume. Across both sides of the deal, that is an average of $6,549,950 per transaction.

7 of those transactions were on the listing side, representing sellers, for $48 million. The other 3 were on the selling side, representing buyers, for $17.5 million. Most of the work, 70 percent, is on the listing side, so Peter is more often the agent a seller hires.

The average price differs by side: $6,858,143 for listings and $5,830,833 for buyer-side sales.

Peter is first by sales volume among the 10 agents in Portola Valley with recorded sales. The typical agent there closed 2 transactions worth $6.6 million, so Peter's volume is about 9.9 times the local median.

Statewide, Peter is 422nd by volume among 115,589 California agents with recorded sales.

In ZIP code 94028, the address on Peter's MLS record, the median sold price was $3,550,000 across 10 sales between June 2026 and July 2026. Peter's average transaction of $6,549,950 is about 1.8 times that median, which points to higher-priced homes than the ZIP code as a whole.

Peter is listed with Golden Gate Sotheby's International Realty, Menlo Park. Other agents on the same office record, busiest first:

• The Dreyfus Group17.5 transactions · 181.3M volume
• Young Platinum Group13 transactions · 72.1M volume
• Michael Dreyfus4 transactions · 54.7M volume
• Shena Hurley3 transactions · 51.6M volume
• Omar Kinaan10.5 transactions · 45.2M volume
• Jennifer Bitter8 transactions · 33.3M volume

These other Portola Valley agents also have recorded sales in the last 12 months. They are ranked by sales volume. Compare a few before you pick someone to interview.

• Kavanaugh Group12.5 transactions · 49M volume
• Dean Asborno5 transactions · 25.1M volume
• John Kavanaugh1 transaction · 8.1M volume
• Dean Asborno1 transaction · 7M volume
• Paul Skrabo2 transactions · 6.3M volume
• Karen Gunn2 transactions · 5.1M volume

The numbers on this page come from public MLS and license records, last updated May 2026. Transaction counts and dollar volumes cover the last 12 months and are credited to the agent named on each record. Peter has not claimed this profile, and a listing here does not mean Peter or Golden Gate Sotheby's International Realty endorses or is affiliated with Expert Agents Near Me. We collect no reviews, so there are no ratings from us on this page.