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Presenting one of the largest Bayfront homes on Promontory Bay, 518 Harbor Island Drive is a study in refined coastal living. Enter through a privately gated courtyard and be greeted by soaring, coffered custom ceilings, marble flooring, rich wood paneling and expansive living spaces. The gourmet chef’s kitchen has top-of-the-line stainless steel appliances, oversized center island with prep sink, and a dumbwaiter. A sprawling master retreat features tray ceilings and includes a sitting room, two fireplaces, master bathroom with dual sinks, deep soaking tub and custom light fixtures, and a beautiful balcony accessed by French doors with unmatched bay, inlet, and city views. A rooftop deck, subterranean wine cellar accessible by a hidden passage way, and billiards room are additional unique highlights of the estate. Rich finishes include oak paneling throughout, stone balustrades, and custom crystal and brass chandeliers. Offering 50’ of water frontage and two 50’ piers to accommodate large vessels as well as additional side tie for duffy, this estate exemplifies the very best in coastal luxury living.
Listing agent: Tim Smith DRE #01346878 tim@timsmithgroup.com, Listing office: Coldwell Banker Res. Brokerage
MLS data updated 11/3/2026, 11:49:39 PM PT
Source: CRMLS, MLS #: NP16022945
Belmont insights
Compare recorded home prices, same-type ZIP sales and mortgage rates.
Dec 29, 2016
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
No recordNo property-price record in this range.ZIP 92660 · Nov 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.