A home first experienced as sculpture, provoking curiosity before comprehension. It does not reveal itself immediately, and the closer you look, the more it rewards. Designed by architect David Jameson, the internationally published NaCl House explores geometry, light, projection, and proportion with extraordinary discipline and control. A beautiful object within the landscape, the home avoids the visual heaviness of the typical contemporary build from the very first approach. Despite spanning three finished levels, its gravity-defying massing and dramatic cantilevered forms allow the structure to settle into the site with composure. Deep overhangs and hovering volumes manipulate natural light throughout the day, allowing the home to extend dramatically beyond its original footprint while preserving more of the site. Shadow, compression, openness, and proportion recalibrate constantly through movement within the home. Walls of glass frame the surrounding landscape with restraint and clarity, while rich mahogany millwork and custom cabinetry introduce warmth and material depth. Volumes stretch unexpectedly, openings appear with exact intention, and even transitional spaces feel carefully authored. Four bedrooms are positioned upstairs, including an exceptional primary suite with some of the home’s most dramatic architectural moments, from a soaring private sitting room to a shower that opens to the sky. On the main level, two dedicated home offices support focused work and retreat. The lower level includes a family room, guest suite, and elevator access to all three floors. The residence reveals itself gradually through movement, shadow, materiality, and sequence. The result is architecture that remains expressive, rigorous, and remarkably controlled, rewarding its residents with continual moments of discovery.
For sale
$3,250,000
7405 Helmsdale Rd, Bethesda, MD 20817
5beds
6,336sqft
Est.:
Single Family Residence
Built in 2011
0.52 Acres Lot
$-- Zestimate®
$513/sqft
$-- HOA
What's special
Guest suiteSoaring private sitting roomTwo dedicated home officesFamily roomSpanning three finished levels
- 3 days |
- 450 |
- 25 |
Likely to sell faster than
Zillow last checked:
Listing updated:
Listed by:
Ron Mangas JR. 703-298-2564,
TTR Sothebys International Realty (703) 714-9030
Source: Bright MLS,MLS#: MDMC2233412
Tour with a local agent
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 5
- Bathrooms: 5
- Full bathrooms: 4
- 1/2 bathrooms: 1
- Main level bathrooms: 1
Basement
- Area: 1146
Heating
- Forced Air, Natural Gas
Cooling
- Central Air, Electric
Appliances
- Included: Down Draft, Dishwasher, Disposal, Dryer, Double Oven, Refrigerator, Stainless Steel Appliance(s), Washer, Water Heater, Gas Water Heater
- Laundry: Upper Level
Features
- Breakfast Area, Ceiling Fan(s), Elevator, Family Room Off Kitchen, Open Floorplan, Kitchen - Gourmet, Kitchen Island, Primary Bath(s), Recessed Lighting, Walk-In Closet(s), 2 Story Ceilings, 9'+ Ceilings
- Flooring: Hardwood, Wood
- Basement: Finished,Interior Entry,Walk-Out Access,Windows,Garage Access
- Number of fireplaces: 2
- Fireplace features: Gas/Propane, Wood Burning
Interior area
- Total structure area: 6,336
- Total interior livable area: 6,336 sqft
- Finished area above ground: 5,190
- Finished area below ground: 1,146
Video & virtual tour
Property
Parking
- Total spaces: 2
- Parking features: Garage Faces Front, Oversized, Attached, Driveway
- Attached garage spaces: 2
- Has uncovered spaces: Yes
Accessibility
- Accessibility features: Accessible Hallway(s), Accessible Elevator Installed
Features
- Levels: Three
- Stories: 3
- Patio & porch: Patio
- Exterior features: Lighting
- Pool features: Community
- Has view: Yes
- View description: Garden
Lot
- Size: 0.52 Acres
Details
- Additional structures: Above Grade, Below Grade
- Parcel number: 160700685740
- Zoning: R200
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Contemporary,Mid-Century Modern
- Property subtype: Single Family Residence
Materials
- Stucco
- Foundation: Other
- Roof: Flat,Rubber
Condition
- Excellent
- New construction: No
- Year built: 2011
Utilities & green energy
- Sewer: Public Sewer
- Water: Public
Community & HOA
Community
- Security: Electric Alarm
- Subdivision: Bannockburn Estates
HOA
- Has HOA: No
Location
- Region: Bethesda
Financial & listing details
- Price per square foot: $513/sqft
- Tax assessed value: $1,600,667
- Annual tax amount: $16,785
- Date on market: 5/12/2026
- Listing agreement: Exclusive Right To Sell
- Ownership: Fee Simple
Estimated market value
Not available
Estimated sales range
Not available
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 5/12/2026 | Listed for sale | $3,250,000-3.7%$513/sqft |
Source:  Bright MLS #MDMC2233412 Report a problem | ||
| 10/15/2025 | Listing removed | $3,375,000$533/sqft |
Source: Bright MLS #MDMC2185718 Report a problem | ||
| 9/11/2025 | Price change | $3,375,000-3.6%$533/sqft |
Source: Bright MLS #MDMC2185718 Report a problem | ||
| 7/11/2025 | Price change | $3,500,000-7.8%$552/sqft |
Source: Bright MLS #MDMC2185718 Report a problem | ||
| 6/17/2025 | Listed for sale | $3,795,000+268.4%$599/sqft |
Source: Bright MLS #MDMC2185718 Report a problem | ||
| 8/13/2007 | Sold | $1,030,000$163/sqft |
Source: Public Record Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2025 | $16,093 +10.9% | $1,374,200 +9% |
| 2024 | $14,518 +9.8% | $1,261,100 +9.9% |
| 2023 | $13,227 +15.8% | $1,148,000 +10.9% |
| 2022 | $11,420 +0.2% | $1,034,900 +0.2% |
| 2021 | $11,393 +0.1% | $1,033,333 +0.2% |
| 2020 | $11,382 +0.2% | $1,031,767 +0.2% |
| 2019 | $11,360 -0.2% | $1,030,200 |
| 2018 | $11,381 -2.3% | $1,030,200 |
| 2017 | $11,649 +36.7% | $1,030,200 -0.6% |
| 2016 | $8,523 | $1,036,800 +7.5% |
| 2015 | $8,523 | $964,200 +8.1% |
| 2014 | $8,523 | $891,600 +8.9% |
| 2013 | -- | $819,000 |
| 2012 | -- | $819,000 |
| 2011 | -- | $819,000 -18.2% |
| 2010 | -- | $1,000,700 +4.8% |
| 2009 | -- | $954,966 +5% |
| 2008 | -- | $909,233 +5.3% |
| 2007 | -- | $863,500 +14.5% |
| 2006 | -- | $753,886 +17% |
| 2005 | -- | $644,273 +20.5% |
| 2004 | -- | $534,660 |
| 2003 | -- | $534,660 +10.5% |
| 2002 | -- | $483,706 +5.6% |
| 2001 | -- | $458,230 |
Find assessor info on the county website
Monthly payment
Est. payment$--/mo
Payment breakdown
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HOA fees may include property taxes on listings classified as Co-Ops. Contact the listing agent and/or owner for fee details.
Mortgage interest rates are dependent on a number of factors, including credit score, down payment, and repayment length. Interest rate data provided by Zillow Group Marketplace, Inc. as of 1/1/1970 from various mortgage lenders with which we have lead or other similar arrangements; the Estimated Payment is an average of those rates.
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Climate risks
Neighborhood: 20817
Nearby schools
GreatSchools rating
- 9/10Bannockburn Elementary SchoolGrades: K-5Distance: 1 mi
- 10/10Thomas W. Pyle Middle SchoolGrades: 6-8Distance: 1.1 mi
- 9/10Walt Whitman High SchoolGrades: 9-12Distance: 1.2 mi
Schools provided by the listing agent
- Elementary: Bannockburn
- Middle: Thomas W. Pyle
- High: Walt Whitman
- District: Montgomery County Public Schools
Source: Bright MLS. This data may not be complete. We recommend contacting the local school district to confirm school assignments for this home.
A local agent can set up tours, give advice and negotiate with sellers.
A local lender can help you make sure your offer is ready when you are.
- Maryland
- Montgomery County
- Bethesda
- 20817
- 7405 Helmsdale Rd
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