3990 Ralston Ave, Hillsborough, CA 94010, USA

Property CA
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1

Property Overview:

This completely transformed Carolands home offers sophisticated elegance and modern luxury on over one-half acre. The property is oriented toward expansive rear grounds featuring a stone terrace, soccer-worthy lawn, and a separately fenced pool and spa. The main home is predominantly single-level with walls of glass and French doors connecting living spaces to the outdoors. There are 4 bedrooms and 3.5 baths, including a primary suite and 2 bedrooms with a shared bath on the main level. The lower level includes a large recreation room, kitchenette, bath, and a fourth bedroom with outside entrance—ideal for extended family living. Detached guest quarters are customized for remote work and include a Murphy bed, custom closets, and a large bath with pool access. Located near top-rated Hillsborough schools, this home blends luxury, flexibility, and indoor/outdoor convenience.

Neighborhood Highlights:

  • Prestigious Carolands neighborhood in Hillsborough
  • Quiet, private setting with mature landscaping
  • Close proximity to top public and private schools
  • Convenient access to downtown Burlingame, San Mateo, and commuter routes
  • Family-friendly community with excellent amenities

Property Features:

  • Extensively remodeled within the last five years
  • Over one-half acre of fully level outdoor space
  • Vast stone terrace and lounge area with fireplace
  • Barbecue kitchen for outdoor entertaining
  • Recently added pool and spa (separately fenced)
  • 4 bedrooms, 3.5 baths in main home
  • Primary suite with private bath
  • Lower level: recreation room, kitchenette, bath, bedroom with outside entrance
  • Detached guest quarters:
    • Large desk and built-in cabinetry
    • Integrated Murphy bed
    • Custom closets by California Closets
    • Large bath with pool access
  • Walls of glass and French doors for seamless indoor/outdoor flow

Location Benefits:

  • Near top-rated Hillsborough schools
  • Private, secure, and tranquil environment
  • Ideal for entertaining and multi-generational living
  • Flexible spaces for remote work or guest accommodations
  • Easy access to shopping, dining, and major commute routes
2

Price and Status History

date type price
1994-06-03 Off Market 650000
2009-01-28 Sold 2400000
2016-05-27 Sold 3850000
2020-03-02 For Sale 4695000
2020-04-10 Sold 4380000
2024-11-01 For Sale 5450000
2024-11-14 Pending NaN
2024-11-27 Sold 5290000
3

Superfund Enterprise Management System

No data found within 1.0 miles for this property.

Toxic Release Inventory

No data found within 1.0 miles for this property.

Integrated Compliance Information System - Air

No data found within 1.0 miles for this property.

4

Flood Risk Info

fld_zone very high impact: up to 0.0001 miles high impact: up to 0.2 miles moderate impact: up to 0.5 miles low-moderate impact: up to 1.5 miles
A 0 0 0 0
AE 0 0 0 0
AH 0 0 0 0
AO 0 0 0 0
VE 0 0 0 0

Flood Zone Type

code meaning
A 1% annual chance flood zone determined using approximate methods. No BFEs shown. Flood insurance and management standards apply.
AE 1% annual chance flood zone determined by detailed methods. BFEs shown. Insurance and floodplain management required.
AH Shallow flooding (ponding) zones with depths between 1-3 feet. BFEs shown. Insurance and management required.
AO Shallow flooding (sheet flow) zones with depths 1-3 feet. BFEs or average depths shown. High-velocity areas may exist.
VE Coastal 1% annual chance flood zone with wave action. BFEs shown. Insurance and management required.

Earthquake Risk Info

zone_name quad_name very high impact: up to 0.0001 miles high impact: up to 2.0 miles moderate impact: up to 10.0 miles
Northern San Gregorio Half Moon Bay 0 0 1
Northern San Gregorio Montara Mountain 0 0 2
Northern San Gregorio San Francisco South 0 0 0
Northern San Gregorio San Mateo 0 0 0
Northern San Gregorio Woodside 0 0 0
San Andreas - Peninsula Half Moon Bay 0 0 0
San Andreas - Peninsula Montara Mountain 0 1 0
San Andreas - Peninsula San Francisco South 0 0 1
San Andreas - Peninsula San Mateo 0 1 0
San Andreas - Peninsula Woodside 0 0 1

Landslide Risk Info

lscat very high impact: up to 0.0001 miles high impact: up to 0.04 miles moderate impact: up to 0.1 miles low-moderate impact: up to 0.2 miles
8 0 0 0 0

Liquefaction Risk Info

Suscept very high impact: up to 0.0001 miles high impact: up to 0.05 miles moderate impact: up to 0.5 miles low-moderate impact: up to 1.0 miles
High 0 0 0 0
Very high 0 0 0 0

Wild fire Risk Info

haz_class very high impact: up to 0.0001 miles high impact: up to 0.5 miles moderate impact: up to 1.5 miles low-moderate impact: up to 3.0 miles
High 0 1 1 2
Very High 0 1 1 4
5

Traffic Noise by Hour x Weekday

hour_of_day Monday Tuesday Wednesday Thursday Friday Saturday Sunday
0 NaN NaN NaN NaN 51 53 NaN
1 NaN NaN 52 44 NaN NaN NaN
2 NaN 53 52 NaN NaN 51 51
3 NaN 52 51 NaN NaN NaN 51
4 NaN NaN NaN NaN NaN NaN 54
5 NaN NaN 53 NaN NaN 49 52
6 48 43 48 49 NaN 48 54
7 NaN 47 49 49 NaN 49 NaN
8 47 NaN NaN NaN 49 NaN NaN
9 NaN NaN NaN NaN NaN NaN 47
10 48 NaN NaN NaN NaN 48 NaN
11 NaN 39 48 48 NaN 52 NaN
12 NaN NaN 49 NaN NaN NaN NaN
13 NaN 52 NaN NaN 49 NaN NaN
14 NaN NaN NaN NaN NaN 54 NaN
15 50 NaN NaN NaN NaN NaN NaN
16 NaN NaN 51 51 50 52 56
17 NaN NaN NaN 52 NaN NaN NaN
18 NaN 54 54 53 55 54 52
19 55 56 54 NaN NaN NaN NaN
20 56 NaN NaN 54 NaN 59 51
21 55 55 NaN NaN 54 NaN 61
22 53 54 52 NaN NaN NaN NaN
23 NaN 54 62 NaN NaN NaN 49
6

Airplane Noise by Hour x Weekday

hour_of_day Monday Tuesday Wednesday Thursday Friday Saturday Sunday
0 3 3 3 3 3 3 2
1 2 2 2 3 3 1 2
2 1 2 2 1 1 1 1
3 1 1 1 1 1 1 1
4 1 1 1 1 2 1 1
5 2 2 2 2 1 2 1
6 3 3 3 4 3 3 3
7 4 4 4 3 4 4 4
8 4 4 5 6 4 5 3
9 6 6 5 5 6 7 7
10 5 4 6 7 8 7 8
11 8 7 8 7 9 9 9
12 8 5 7 7 9 6 6
13 9 10 9 9 8 8 7
14 6 6 8 7 10 7 6
15 5 5 6 7 6 5 6
16 5 6 6 10 6 5 6
17 5 5 6 5 5 4 5
18 4 4 4 4 5 3 4
19 5 6 5 6 5 5 4
20 3 4 4 4 3 4 3
21 4 3 4 5 3 3 3
22 3 3 3 2 2 3 3
23 4 4 4 5 4 4 4