20820 Timberline Ln is a 1,546 square foot house on a 4,060 square foot lot with 3 bedrooms and 3 bathrooms. - it last sold on August 04, 1988 for $167,000. Based on Redfin's Walnut data, we estimate the home's value is $914,186.
Single-familyProperty Type
1989Year Built
4,060 sq ftLot Size
$591Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$914,186
$747K since sold in August 1988$12K since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 20.3% lower than the average sale price ($1.15M) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning
RL
Low Density Residential District
The RL zoning district is intended primarily for parcels developed with existing detached single-family dwellings. The maximum allowed density for new residential subdivisions within this zoning district will be three dwellings per gross acre. The RL zoning district is consistent with the low density residential land use category of the general plan.
Permitted uses
Include but are not limited to:
Livestock production
Housing-Single unit
Housing-Senior
Housing-Other
Infrastructure
Fire house
Police station
Park & open space
Property details
Interior
Heating & Cooling
Air Conditioning Type: Central
Heating Type: Central
Exterior
Property Information
Subdivision Name: 45268
Living Sq. Ft: 1,546
# of Units: 1
Legal Description: TR=45268 LOT 23
Lot Information
# of Buildings: 1
Land Sq. Ft: 4,060
Legal Lot Number: 23
Municipality Name: DIAMOND BAR
Acres: 0.0932
Zoning Code: LCRPD100006U*
County Use Description: SINGLE FAMILY RESID
Financial
Assessor Information
Assessment Year: 2026
Public facts
Beds: 3
Baths: 3.0
Sq. Ft.: 1,546
Stories: —
Lot Size: 4,060 square feet
Style: Single Family Residential
Year Built: 1989
Year Renovated: 1989
County: Los Angeles County
APN: 8765009028
Home facts updated by county records on Oct 7, 2026
Around this home
Schools
Castle Rock Elementary School
Public K-5 • Assigned • 0.6mi
10/10
South Pointe Middle School
Public 6-8 • Assigned • 1.1mi
10/10
Diamond Bar High School
Public 9-12 • Assigned • 0.8mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Local insights from Redfin agents
The Diamond Bar market is shifting, creating new opportunities for both buyers and sellers. Buyers have a bit more negotiating room, while well-priced, well-maintained homes can still attract strong interest. If you’re considering a move, I’d be...
happy to provide a personalized market analysis based