A record-breaking $12.3 million sale in Monte Sereno anchored a week of significant real estate activity across the South Bay. During the week of Sept. 28, 133 residential transactions were recorded, with the region seeing an average sale price of $2 million.

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The $12.3 million modern estate in Monte Sereno

The Monte Sereno property that closed for $12.3 million stands as the clear leader in this week's regional report . As reported by the source, this modern residence was constructed in 2022 and spans 4,437 square feet of living space.. The transaction, which was finalized on Sept. 23, resulted in a price of $2,772 per square foot.

This high-value sale features four bedrooms and five bathrooms, meeting the luxury standards expected in this exclusive peninsula community. The sale serves as a benchmark for the ultra-luxury tier of the South Bay market, where recent inventory has focused on contemporary builds rather than historic renovations.

Palo Alto’s $3,940 per square foot premium

While the Monte Sereno sale dominated the total price, a smaller property in Palo Alto demonstrated the extreme value placed on location and historic charm. A 1,142-square-foot home on Guinda Street, built in 1924, sold for $4.5 million, commanding a massive $3,940 per square foot. This highlights a trend where buyers are willing to pay a significant premium for smaller, older structures within established school districts.

This trend is further evidenced by another transaction on the same street.. A larger 2 ,442-square-foot residence in the 1100 block of Guinda Street, built in 1930, closed on Sept. 24 for $6.5 million. According to the report, that property traded at $2,662 per square foot, showing that even larger historic homes in Palo Alto face intense competition for limited inventory.

From $967 in Saratoga to $4.8 million in San Jose

The South Bay market data reveals a wide spectrum of pricing across different municipalities and architectural styles. In Saratoga, a substantial 5,171-square-foot home on Sobey Road, built in 1951, sold for $5 million. Because of its large footprint, the price per square foot for the Sobey Road property was recorded at $967, illustrating how lot size can significantly lower the per-foot valuation compared to denser luxury markets.

San Jose also contributed to the region's diverse transactional volume. A 4,345-square-foot residence on University Avenue sold for $4.8 million on Sept. 22. This four-bedroom, four-bathroom home, built in 1940, traded at $1,105 per square foot, helping to balance the regional average against the ultra-high-end outliers found in Monte Sereno.

The missing data behind the Sept. 24 closing surge

While the volume of 133 sales indicates a robust market, several key details remain unverified.. The report focuses exclusively on public record data, leaving it unclear whether these transactions were driven by cash buyers or those navigating current interest rates with traditional financing. Additionally, the source does not provide the identity of the buyers or the motivations behind the synchronized closing dates observed around Sept. 24.

It also remains unknown how much the $2 million regional average is being skewed by the top-tier luxury sales. Without a breakdown of mid-market versus luxury volume, it is difficult to determine if the average price reflects a broad upward trend or is simply an artifact of a few massive transactions in Monte Sereno and Palo Alto.