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Selling primarily for land value, this exceptional and FULLY USABLE 1.83-acre lot sits elevated within the prestigious 24-hour guard-gated community of The Country Estates, surrounded by multi-million dollar estates and offering sweeping panoramic valley views. The property currently includes a MAIN HOUSE of approximately 3,720 sq ft (physical measurement), along with an ADDITIONAL SEPARATE ADU/ pool house of approximately 1,008 sq ft (physical measurement), and a detached four-car garage of approximately 1,035 sq ft (physical measurement). The property is being sold strictly in AS-IS condition. The seller will not perform any repairs. Cash buyers only. A prior custom estate plan—designed by a renowned architect—was approved by the city in September 2019 (now expired) for an approximately 15,000 sq ft luxury residence. The design included nine suites, guest quarters, a grand 1,500 sq ft great room, gym, courtyard, pool, tennis court, and a subterranean garage accommodating 7+ vehicles. All information provided is deemed reliable but not guaranteed. Buyers are responsible for independently verifying all measurements, details, and requirements with the City of Diamond Bar and the HOA, including any matters related to plan approval, renewal, or modifications. Located within the highly acclaimed Walnut Valley Unified School District. A rare opportunity to create and build your dream estate in one of the area’s most sought-after communities.
Listing agent: Semiwati Tan DRE #01915100 satogroupinc@gmail.com, Listing office: Adequate Real Estate Service
MLS data updated 10/16/2026, 10:36:07 PM PT
Source: CRMLS, MLS #: IG26198025
Belmont insights
Compare recorded home prices, same-type ZIP sales and mortgage rates.
Sep 9, 2026
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This home · nearest recorded event
$1,699,000Original asking price · Sep 9, 2026ZIP 91765 · Sep 2026
No monthly averageAt least 3 eligible sales in this month are required.30-year fixed mortgage benchmark
No weekly rateNo published rate within 7 days of this date.No recorded sales in this range. Select All available for older records; missing records do not mean the home never sold.
ZIP averages use publicly displayable closed sales from our licensed MLS feed, matched to the same ZIP and exact property type. Months with fewer than 3 sales are omitted; the current month is incomplete. Lines connect available monthly observations across gaps and do not represent measured prices in missing months. These averages are not adjusted for size, condition, or location within the ZIP, and are not an appraisal. Feed coverage may not include every sale. All available shows the available home and ZIP history, with mortgage rates over the same dates.
Mortgage benchmark: Freddie Mac Primary Mortgage Market Survey®. © Freddie Mac. Weekly national 30-year fixed rates, not APRs or a loan quote. Actual terms vary. Methodology changed in November 2022. The chart does not establish that interest-rate changes caused a home’s price changes.
Lines connect recorded asking and sale prices. They are visual guides, not estimates of the home’s value between those dates.
No earlier records were returned by our current sources. This does not mean the home has never sold.
MLS records may be incomplete. Earlier asking prices are not sale prices.