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The Frank House -- a.k.a. Case Study House #25 -- is a groundbreaking and historical achievement in residential design from internationally renowned architecture firm Killingsworth, Brady, Smith & Associates. Situated on Rivo Alto Canal in Naples, this modern masterpiece is approached by a pathway of steppingstones over a reflecting pool and is entered through a dramatic 17 foot high front door that reveals a two-story interior courtyard with views into the adjacent living room and dining room downstairs, and master bedroom and study upstairs. Most of the interior living areas look out to the courtyard through walls of glass, providing the experience of indoor/outdoor living without the compromise of privacy. Both the living room and master bedroom also have sweeping views of adjacent Naples Canal, which is an aquatic haven for boaters, kayakers, paddle boarders and swimmers (40 foot private boat dock is included with the property). This exceptional residence is at once elegant and relaxed, and it reflects the timeless brilliance of Ed Killingsworth’s mastery of scale, light and proportion. The Frank House is widely considered to be one of the finest achievements of the midcentury modern era, and it has been meticulously maintained by its current owners.
Listing agent: Douglas Kramer DRE #01374637 doug@socalmodern.com, Listing office: Re/Max R. E. Specialists
MLS data updated 11/3/2026, 10:26:59 AM PT
Source: CRMLS, MLS #: PW15040430
Belmont insights
Compare recorded home prices, same-type ZIP sales and mortgage rates.
Jul 14, 2015
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 90803 · 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.