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673 Castlehill, Walnut, CA 91789

$1.39M4bd · 4ba · 2,579 sqft
Lot 12,225 sqft•Single Family Residence•
Active
•26d on market•MLS# IG-26218237

Property Description

BRAND-NEW CUSTOM LUXURY HOME WITH BREATHTAKING CITY-LIGHT VIEWS IN WALNUT! This exceptional 4-bedroom, 3.5-bath residence sits on an expansive 12,000+ sq. ft. lot and offers approximately 2,579 sq. ft. of beautifully designed living space with premium, high-quality upgrades throughout. Soaring ceilings, sophisticated finishes, an open-concept floor plan, and panoramic city-light and rolling-hill views create an exceptional blend of luxury, comfort, and modern living. The impressive gourmet kitchen is the centerpiece of the home, featuring an upgraded backsplash, elegant glass-front cabinetry, quartz countertops, a large center island, and soft-closing drawers. It flows seamlessly into the dining and spacious family room, creating an ideal space for entertaining and everyday gatherings. A fireplace adds warmth to the family room, while luxury vinyl plank flooring and high ceilings enhance the home's contemporary style. The main level features a private ensuite bedroom, ideal for guests, extended family, or multigenerational living, plus a separate powder room. Upstairs, the luxurious primary suite offers a spa-inspired retreat with a freestanding soaking tub, walk-in shower, and oversized walk-in closet. Two additional bedrooms share a convenient Jack-and-Jill bathroom. The oversized garage features epoxy flooring, abundant storage, and direct access to the home. The expansive backyard offers beautiful city-light and hillside views, along with potential for an ADU or additional outdoor living space, subject to applicable city requirements. An additional street at the rear of the property provides added access and flexibility. NO HOA. NO MELLO-ROOS. Located in the highly regarded Walnut Valley Unified School District, this home is conveniently close to shopping, dining, entertainment, major freeways, and everyday conveniences. A rare opportunity to own a brand-new custom luxury home on a premium oversized lot with exceptional views, high-quality upgrades, and no HOA or Mello-Roos in the heart of Walnut.

Features & Amenities

FeeBuilt 2026

Property Details

Land Type
Fee
Year Built
2026
Property Type
Residential
Property Subtype
Single Family Residence
Parking Spaces
2
Garage Spaces
2
Cooling
Central Air
View
Panoramic
City
Walnut
Zip Code
91789
County
Los Angeles
Listed byJL Realty & Management, Julie Lee

Mortgage Calculator

Current Rates

$
$
%
Monthly Payment
$7,018.48
Principal & Interest
Loan Amount
$1,110,400
Total Interest
$1,416,254
Total Payment Over 30 Years
$2,526,654
This calculator provides estimates only. Actual mortgage payments may include taxes, insurance, HOA fees, and PMI. Contact a lender for accurate quotes.

Comparative Market Analysis

Residential Tier · 5 active · 5 closed

673 Castlehill, Walnut, CA 91789

Walnut · Single Family Residence

$1.39M
Residential Tier
Beds
4
Baths
4
Sqft
2,579
Lot
12,225 sqft
Year
2026
$/Sqft
$538
Pool: No✓
View: city✓
Garage: 2-car✓

Listed 12.4% above the median closed sale of $1,235,000.

Price Position

Positioned above the market — commands a premium.

Premium
Subject listed at $1.39M· $538/sqft
Total list price
Closed comps
vs closed median $1.24M
+$153K (+12.4%)
Active comps
vs active median $1.39M
−$888 (−0.1%)
Price per sqft
Closed compsinsufficient comp data
Active comps
vs active avg $/sqft $598
−$60 (−10.0%)

Active Properties (5)

Active Comparables

AddressCityYearBDBTHSqFtLotSzLP/SqFtLPDIMScore
685 Castlehill DriveWalnut2026442,46712,060$567$1.40M7598
693 Castlehill DriveWalnut2026442,4329,944$571$1.39M8896
677 Castlehill DriveWalnut2026452,90013,525$414$1.20M994
539 BourdetWalnut2005442,6768,040$523$1.40M7484
438 Calle AlcazarWalnut1977321,42020,990$915$1.30M10058
Total: 5 · Average3.83.82,37912,911.8$598$1.34M69.2
Median2,467$1.39M

Closed Properties (5)

Closed Comparables

AddressCityYearDateBDBTHSqFtLotSzLPSPSP/SqFtSP/LPDIMScore
19569 Vista Hermosa DriveWalnut197705/22/2026452,41910,530$1.50M$1.44M$5930.9628181
1135 Belbury DrDiamond Bar200007/31/2026452,2236,315$1.40M$1.38M$6210.996371
20123 PadrinoWalnut197806/30/2026632,8226,889$1.25M$1.18M$4180.948068
19735 Camino ArroyoWalnut197705/26/2026431,8598,080$1.23M$1.24M$6641.012566
19819 Camino ArroyoWalnut197705/04/2026431,8599,783$1.16M$1.20M$6461.044065
Total: 5 · Average4.43.82,236.48,319.4$1.29M$1.29M$588.4—97.8
Median2,223$1.24M$1.24M

Market Analysis

List vs Sale $/SqFt

Sale Price Trend

Days on Market

Sale vs List Price

AI-generated CMA

This analysis was generated automatically from MLS data. For an in-depth, human-reviewed valuation, contact Joseph Sardella at josephsardella@gmail.com.