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Positioned within the highly desirable Concours Plaza business park, 3333 Concours St., Building 4 presents a rare opportunity to acquire a high-image, two-story professional office building in the heart of Ontario’s thriving Airport Area submarket. Constructed in 2005, the property features modern architectural design, quality interior build-out, and abundant natural light, creating an ideal environment for professional office, medical, or owner-user occupancy. The building offers a flexible layout with private offices, conference areas, and support space, making it suitable for a wide range of users. Strategically located just west of Haven Avenue, the property provides immediate access to the I-10, I-15, and 210 freeways, and is within minutes of Ontario International Airport, major business hubs, hotels, and retail amenities. This prime location supports both long-term investment stability and strong user demand. With its combination of institutional-quality design, excellent accessibility, and premier business park setting, this asset represents an exceptional opportunity for investors and owner-users seeking a presence in one of the Inland Empire’s most dynamic commercial corridors.
Listing agent: HELEN G. ZHANG DRE #01890497 Hzhang@mgrrealestate.com, Listing office: M G R REAL ESTATE
MLS data updated 10/25/2026, 7:10:32 AM PT
Source: CRMLS, MLS #: IV26072128
Belmont insights
Compare recorded home prices, same-type ZIP sales and mortgage rates.
Sep 27, 2026
Prices use the left axis; mortgage rates use the right. Hover, tap, or focus the chart and use the arrow keys. Red SOLD badges mark recorded sales.
This home · nearest recorded event
$4,250,000Asking price recorded · Sep 27, 2026ZIP 91764 · 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.