This home goes beyond cosmetic updates with a complete infrastructure overhaul * * * Electrical - upgraded 200Amp MAIN PANEL & whole-house WIRE REPLACEMENT * * * Plumbing - full re-piping with durable Type-L COPPER * * * New Insulation throughout the entire house & garage paired with New HVAC Ducting * * * Interior defined by quality & safety, featuring ALL NEW FIRE-CODE drywall and ceilings, ALL NEW energy-efficient windows and patio door * * * The chef-inspired kitchen showcases European-style cabinets, sleek Quartz countertop, an 18-gauge stainless steel single sink & all New appliances * * * the curb appeal is enhanced by fresh paint, new garage door, new seamless gutters and a refurbished roof with new felt paper & reset tiles * * * RV Parking available * * * The backyard includes mature fruit trees and an established pool ready for its new owner’s personal touch * * * easy access to freeway * * * few minutes to market and school * * * it's NOT a flip house * * * Transformed 5-beds, 3-baths, Single-Story home, located in the highly sought-after Walnut School District. * * * The residence has been renovated down to the studs, offering the peace of mind of a Brand-New home with the character of an established neighborhood. * * *
Single-familyProperty Type
1980Year Built
8,312 sq ftLot Size
$643Price/Sq.Ft.
3 car garageParking
Listed by Yingqi Guan•DRE #01989489• Pacific Sterling Realty
Contact: 626-991-3801
Bought with LYNN DU TRAN•DRE #01035977• IRN REALTY
Est. $3,547 per month, based on comparable rentals
Sale and tax history for 21030 Riego
Sale History
Tax History
Date
Event
Price
CRMLS #TR26018437
Apr 17, 2026
Sold
$1,388,000
$643/sq ft
Apr 8, 2026
Pending
—
Mar 19, 2026
Contingent
—
Mar 3, 2026
Relisted
—
Mar 3, 2026
Price Changed
$1,428,000
$662/sq ft
Feb 19, 2026
Price Changed
$1,449,999
$672/sq ft
Jan 26, 2026
Listed
$1,450,000
$672/sq ft
Public Records
Dec 23, 1986
Sold
$173,000
$80/sq ft
Public Records
Dec 30, 1980
Sold
$131,000
$61/sq ft
Year
Property tax
Land + Additions
Assessment*
2025
$12,703 (+185.2%)
$720,581 + $309,414
$1,029,995
2024
$4,454 (+2.3%)
$706,452 + $303,348
$1,009,800
2023
$4,353 (+2.2%)
$132,433 + $198,668
$331,101
2022
$4,261 (+2.0%)
$129,837 + $194,773
$324,610
2021
$4,175 (+1.2%)
$127,292 + $190,954
$318,246
2020
$4,124 (+1.9%)
$124,797 + $187,210
$312,007
2019
$4,048 (+6.1%)
$123,518 + $185,291
$308,809
2018
$3,814 (+4.6%)
$121,097 + $181,658
$302,755
2017
$3,646 (+3.3%)
$116,396 + $174,605
$291,001
2016
$3,528 (−0.5%)
$116,396 + $174,605
$291,001
2015
$3,546 (−0.2%)
$114,114 + $171,182
$285,296
2014
$3,553 (+1.3%)
$110,199 + $165,309
$275,508
2012
$3,506 (+3.0%)
$109,701 + $164,562
$274,263
2011
$3,405 (+0.9%)
$107,550 + $161,336
$268,886
2010
$3,376 (+0.6%)
$105,442 + $158,173
$263,615
2009
$3,356 (+2.9%)
$104,654 + $156,991
$261,645
2008
$3,260
$104,903 + $157,364
$262,267
Public record
Public record
Zoning
Beds
4
Baths
2
Stories
—
Lot width
—
Lot depth
—
Lot size
8,312 Sq. Ft.
Year renovated
1980
Sq. Ft.
1,892
Year built
1980
Style
Single Family Residential
County
Los Angeles County
APN
8765013018
Parking Spaces
—
Basement
—
Accessible
—
HOA Dues
—
Garage
—
Features
—
Last updated by owner on Oct 7, 2026.
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
Parking
Parking / Garage Information
Attached Garage
# of Garage Spaces: 3
Garage, Direct Garage Access, RV Access/Parking, Garage - Front Entry, Driveway, Private, Garage Door Opener, Garage - Two Door
Has Parking
# of Parking Spaces: 3
Interior
Laundry Information
Has Laundry
Individual Room
Kitchen Information
Appliances: Gas Water Heater, Range/Stove Hood, Gas Oven, Dishwasher
Has Appliances
Breakfast Counter / Bar, Area
Kitchen Open to Family Room, Quartz Counters, Remodeled Kitchen, Kitchen Island
Bathroom Information
# of Baths (Full): 3
Quartz Counters, Shower in Tub, Exhaust fan(s), Main Floor Full Bath, Bathtub, Remodeled
Cooling Information
Central
Has Cooling
Room Information
Walk-In Closet, Laundry, All Bedrooms Down, Main Floor Primary Bedroom, Kitchen, Great Room, Main Floor Bedroom
Fireplace Information
Great Room
Has Fireplace
Flooring Information
Vinyl
Heating Information
Central Furnace
Has Heating
Interior Features
Entry Level: 1
Entry Location: 1
Quartz Counters, Recessed Lighting, Copper Plumbing Full
Levels: One
Main Level Bathrooms: 3
Main Level Bedrooms: 5
Security Features: Carbon Monoxide Detector(s), Fire Rated Drywall, Smoke Detector
Exterior
Exterior Information
Structure Type: House
Exterior Features
Rain Gutters
Pool Features: Private
Has Pool
Has Sprinklers
Lot Information
Elevation Units: Feet
Lot Size Source: Assessor's Data
Lot Features: Lot 6500-9999, 0-1 Unit/Acre, Front Yard, Sprinkler System, Back Yard
Property Information
Total # of Units: 1
Common Walls: No Common Walls
Living Area Source: Seller
Parcel Number: 8765013018
Total # of Stories: 1
Year Built Source: Assessor
Property ADU: No
Financial
Assesments Information
Assessments: Unknown
Utilities
Utilities Information
Sewer: Public Sewer
Water Source: District/Public
Location
Neighborhood Information
Community Features: Sidewalks, Suburban
School Information
Elementary School: Castle Rock
Middle Or Junior School: Southpoint
High School: Diamond Bar
High School District: Walnut Valley Unified
Elementary School 2: CASROC
Middle Or Junior School 2: SOUTHP
High School 2: DIABAR
Location Information
Latitude: 33.97324700
Longitude: -117.84671600
Directions: S Diamond Bar Blvd towards Fallow Field Dr towards E Riego Dr.
Public facts
Beds: 4
Baths: 2.0
Sq. Ft.: 1,892
Stories: —
Lot Size: 8,312 square feet
Style: Single Family Residential
Year Built: 1980
Year Renovated: 1980
County: Los Angeles County
APN: 8765013018
Home facts updated by county records on Oct 7, 2026
Other
Listing Information
IDX Contact Info: 626-991-3801
Days Active in MLS: 43
Continuous Days Active in MLS: 43
Listing Agent Information
List Agent First Name: Yingqi
List Agent Last Name: Guan
Listing Office Information
List Office Name: Pacific Sterling Realty
Selling Agent Information
Buyer Agent First Name: LYNN
Buyer Agent Last Name: DU TRAN
Selling Office Information
Buyer Office Name: IRN REALTY
Around this home
Schools
Castle Rock Elementary School
Public K-5 • Assigned • 0.2mi
10/10
South Pointe Middle School
Public 6-8 • Assigned • 1.3mi
10/10
Diamond Bar High School
Public 9-12 • Assigned • 0.7mi
10/10
Provided by GreatSchools
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
5/10 Fire Factor
5% chance of being in a wildfire in next 30 years
6/10 Heat Factor
7 days above 98° expected this year, 21 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
6/10 Air Factor
10 unhealthy days expected this year, 13 days in 30 years
Provided by First Street
Historical weather
Diamond Bar, CA • 91765
Average low and high temperatures (°F)
68
50
71
52
73
53
72
53
76
57
81
60
86
63
89
65
85
65
80
59
71
52
69
51
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun exposure
78/ 100
Good sunlight
Sunscore
This home receives average direct sun exposure in Diamond Bar. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.
8.5 hrs
5 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$1.42M – $1.72M
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