For the very first time in its storied history, this 1936 family estate is being offered to the public. This classic English Tudor is a landmark in its own right, a home that gracefully bridges Hillsborough's past and present. Set on nearly an acre of level land with views of the Bay and San Francisco skyline, the residence embodies timeless elegance. Its centerpiece is a remarkable floating spiral staircase anchored only at the bottom and top. With a large open kitchen connecting to the family room, plus 5 bedrooms and 5 full bathrooms (2 half baths), the estate is ready and waiting for its next owner (some photos are virtually staged)! There is a bedroom, library and full bathroom on the main level. The primary bedroom and 3 add'l bedrooms are upstairs. Outdoors, the gardens carry the signature of renowned landscape architect Thomas Church, whose designs shaped much of California's most beautiful private estates with broad lawns, graceful plantings and private spaces. Built by the Wisnoms, one of the founding families of San Mateo, The National Bank of San Mateo and cousins of Wisnoms Hardware family. This offering represents a rare opportunity: to own a piece of Hillsborough history and to become the next steward of a home designed with both legacy and livability at its core.
Single-familyProperty Type
1936Year Built
1.03 acresLot Size
$1,289Est. Price/Sq.Ft.
3 car garageParking
Listed by Alexa The Dwyer Group•DRE #70010007• Compass
For the very first time in its storied history, this 1936 family estate is being offered to the public. This classic English Tudor is a landmark in its own right, a home that gracefully bridges Hillsborough's past and present. Set on nearly an acre of level land with views of the Bay and San Francisco skyline, the residence embodies timeless elegance. Its centerpiece is a remarkable floating spiral staircase anchored only at the bottom and top. With a large open kitchen connecting to the family room, plus 5 bedrooms and 5 full bathrooms (2 half baths), the estate is ready and waiting for its next owner (some photos are virtually staged)! There is a bedroom, library and full bathroom on the main level. The primary bedroom and 3 add'l bedrooms are upstairs. Outdoors, the gardens carry the signature of renowned landscape architect Thomas Church, whose designs shaped much of California's most beautiful private estates with broad lawns, graceful plantings and private spaces. Built by the Wisnoms, one of the founding families of San Mateo, The National Bank of San Mateo and cousins of Wisnoms Hardware family. This offering represents a rare opportunity: to own a piece of Hillsborough history and to become the next steward of a home designed with both legacy and livability at its core.
Year
Property tax
Land + Additions
Assessment*
2025
$40,744 (+2.2%)
$2,064,992 + $1,042,650
$3,107,642
2024
$39,870 (+1.7%)
$2,064,992 + $1,042,650
$3,107,642
2023
$39,195 (+4.2%)
$2,024,503 + $1,022,207
$3,046,710
2022
$37,613 (+2.2%)
$1,984,808 + $1,002,165
$2,986,973
2021
$36,804 (+1.8%)
$1,945,891 + $982,515
$2,928,406
2020
$36,142 (+2.4%)
$1,907,737 + $963,251
$2,870,988
2019
$35,279 (+3.1%)
$1,888,176 + $953,375
$2,841,551
2018
$34,219 (+1.8%)
$1,851,154 + $934,682
$2,785,836
2017
$33,600 (+2.8%)
$1,779,273 + $898,389
$2,677,662
2016
$32,688 (+1.6%)
$1,779,273 + $898,389
$2,677,662
2015
$32,163 (+2.7%)
$1,744,386 + $880,774
$2,625,160
2014
$31,321 (+3.8%)
$1,684,529 + $850,552
$2,535,081
2012
$30,176 (+3.2%)
$1,676,917 + $846,709
$2,523,626
2011
$29,249 (+80.7%)
$1,644,037 + $830,108
$2,474,145
2010
$16,184 (+0.5%)
$1,611,802 + $813,832
$2,425,634
2009
$16,106 (+2.3%)
$578,544 + $664,059
$1,242,603
2008
$15,749
$579,919 + $665,637
$1,245,556
Tax history for 923 Hayne Rd
Year
Property tax
Land + Additions
Assessment*
2025
$40,744 (+2.2%)
$2,064,992 + $1,042,650
$3,107,642
2024
$39,870 (+1.7%)
$2,064,992 + $1,042,650
$3,107,642
2023
$39,195 (+4.2%)
$2,024,503 + $1,022,207
$3,046,710
2022
$37,613 (+2.2%)
$1,984,808 + $1,002,165
$2,986,973
2021
$36,804 (+1.8%)
$1,945,891 + $982,515
$2,928,406
2020
$36,142 (+2.4%)
$1,907,737 + $963,251
$2,870,988
2019
$35,279 (+3.1%)
$1,888,176 + $953,375
$2,841,551
2018
$34,219 (+1.8%)
$1,851,154 + $934,682
$2,785,836
2017
$33,600 (+2.8%)
$1,779,273 + $898,389
$2,677,662
2016
$32,688 (+1.6%)
$1,779,273 + $898,389
$2,677,662
2015
$32,163 (+2.7%)
$1,744,386 + $880,774
$2,625,160
2014
$31,321 (+3.8%)
$1,684,529 + $850,552
$2,535,081
2012
$30,176 (+3.2%)
$1,676,917 + $846,709
$2,523,626
2011
$29,249 (+80.7%)
$1,644,037 + $830,108
$2,474,145
2010
$16,184 (+0.5%)
$1,611,802 + $813,832
$2,425,634
2009
$16,106 (+2.3%)
$578,544 + $664,059
$1,242,603
2008
$15,749
$579,919 + $665,637
$1,245,556
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Public record
Public record
Permits
Beds
5
Baths
5.75
Stories
2
Lot width
—
Lot depth
—
Lot size
45,025
Year renovated
—
Sq. Ft.
5,965
Year built
1936
Style
Single Family Residential
County
San Mateo County
APN
031111020
Parking Spaces
3
Basement
No
Accessible
No
HOA Dues
—
Garage
Yes
Features
—
Last updated by owner on Jul 2, 2026.
Feb 23, 2026 • Final
Upper sewer lateral
Replace the sewer line and perform sewer and water testing.
Plumbing
Feb 23, 2026 • Final
Lower sewer lateral
Remove and replace the lower lateral sewer line to the manhole.
Plumbing
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Parking
Parking Information
Garage (Minimum): 3
Garage (Maximum): 3
Parking Description: Attached Garage
Garage Spaces: 3
Interior
Virtual Tour
Bedroom Information
# of Bedrooms (Minimum): 5
# of Bedrooms (Maximum): 5
Bathroom Information
# of Baths (Full): 5
# of Baths (1/2): 2
Room Information
Family Room Description: Kitchen/Family Room Combo, Separate Family Room
Dining Room Description: Formal Dining Room
Fireplace Information
Has Fireplace
Fireplace Description: In Family Room, In Living Room, In Primary Bedroom, Other (See Remarks)
Fireplaces (Minimum): 4
Heating & Cooling Information
Heating: Forced Air
Exterior
Exterior Features
Roof: Other (See Remarks)
Yard/Grounds: Balcony/Patio, Sprinkler(s) (Lawn)
Building Information
Subclass: Single Family Home
Building Type: Detached
Other
Property Features
Living Sq. Ft.: 5,050
Property Information
Property Primary ID: 734882
Lot Information
Lot Acres: 0.9773
Lot Size Area Minimum Units: Sq. Ft.
Lot Size Area Maximum Units: Sq. Ft.
Lot Size Source: Assessor
Zoning: R10025
Utilities
Utility Information
Sewer Septic: Sewer (Public)
Utilities: Public Utilities
Water Information
Water: Public
Location
Multi-Unit Information
# of Stories: 2
School Information
Elementary School District: Hillsborough City Elementary
High School District: San Mateo Union High
Public facts
Beds: 5
Baths: 5.75
Sq. Ft.: 5,965
Stories: 2.0
Parking Spaces: 3
Basement: No
Accessible: No
Lot Size: 1.03 acres
Style: Single Family Residential
Year Built: 1936
Year Renovated: —
County: San Mateo County
APN: 031111020
HOA Dues: —
Garage: Yes
Features: —
Home facts updated by owner on Jul 2, 2026
Around this home
Schools
North Hillsborough School
Public K-5 • Assigned • 1.0mi
9/10
Crocker Middle School
Public 6-8 • Assigned • 1.0mi
8/10
San Mateo High School
Public 9-12 • Assigned • 2.0mi
9/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
2/10 Heat Factor
3 days above 85° expected this year, 7 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
7/10 Air Factor
12 unhealthy days expected this year, 12 days in 30 years
Provided by First Street
Historical weather
Hillsborough, CA • 94010
Average low and high temperatures (°F)
60
47
62
48
67
50
65
51
68
52
70
54
69
56
72
58
73
59
72
57
63
52
59
50
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
In this area, properties receive around 10.5 hours in
June and 5 hours in December, placing it above the
U.S. average for solar exposure.
10.5 hrs
5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$7.30M – $8.84M
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