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$3,100,000

  • Sold
  • Closed
  • Single Family
  • 5 Beds
  • 4 Full Baths
  • 1 Partial Bath
  • 6,336 Sq. Ft.
  • 2 Car Garage
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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, recipient of a 2014 Residential Architect Magazine Design Award for this project, 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. Widely recognized for its architectural significance, the NaCl House remains one of the region's most compelling modern residences. The result is architecture that remains expressive, rigorous, and remarkably controlled, rewarding its residents with continual moments of discovery.

Full Property Details for 7405 Helmsdale Rd

General

  • Sold For: $3,100,000
  • Taxes: $16,785 (2026)
  • Status: Closed
  • Type: Single Family
  • Source: BrightMLSMidAtlantic
  • MLS ID: MDMC2233412
  • Added to Site: 109 day(s) ago

Interior

  • Interior Features: Breakfast Area, Ceiling Fan(s), Elevator, Family Room Off Kitchen, Floor Plan - Open, Kitchen - Gourmet, Kitchen - Island, Primary Bath(s), Recessed Lighting, Walk-in Closet(s), Wood Floors
  • Fireplace: Yes
  • Number of Fireplaces: 2
  • Fireplace(s): Gas/Propane, Wood
  • Appliances: Cooktop - Down Draft, Dishwasher, Disposal, Dryer, Oven - Double, Refrigerator, Stainless Steel Appliances, Washer, Water Heater
  • Flooring: Hardwood

Rooms

Bathrooms

  • Total Bathrooms: 5
  • Full Bathrooms: 4
  • Half Bathrooms: 1
  • Upper Floor Baths: 3
  • Upper - Full Baths: 3
  • Main Floor Baths: 1
  • Main - 1/2 Baths: 1
  • Lower Floor Baths: 1
  • Lower - Full Baths: 1

Bedrooms

  • Total Bedrooms: 5
  • Bedrooms Upper: 4
  • Bedrooms Lower: 1

Other Rooms

  • Laundry: Upper Floor

Additional Information

  • Shared Pool: Yes
  • Pool: Yes
  • Security/Safety: Electric Alarm

Exterior

  • Exterior Features: Exterior Lighting
  • Porch/Patio/Deck: Patio(s)

Parking

  • Garage: Yes
  • Garage Spaces: 2
  • Total Spaces: 2
  • Parking Type: Attached Garage, Driveway
  • Garage Description: Garage - Front Entry, Oversized

Location

  • County: MONTGOMERY
  • Subdivision: BANNOCKBURN ESTATES
  • Cross Streets: Nevis
  • Driving Directions: From Nevis, head North, House is on the Right.
  • Direction Faces: West

School Information

  • School District: Montgomery County Public Schools
  • Elementary School: Bannockburn
  • Middle School: Thomas W. Pyle
  • High School: Walt Whitman

Community

  • Pets Allowed: Yes
  • Pets: No Pet Restrictions

Heating & Cooling

  • Central air: Yes
  • Cooling Type: Central A/C
  • Cooling Fuel: Electric
  • Heating Type: Forced Air
  • Heating Fuel: Natural Gas
  • Water Heater: Natural Gas

Utilities

  • Sewer: Public Sewer
  • Water: Public

Structural Information

  • Architectural Style: Contemporary, Mid-Century Modern
  • Structure Type: Detached
  • Architect: David Jameson
  • Construction: Stucco
  • Basement: Yes
  • Basement Desc.: Fully Finished, Interior Access, Walkout Level, Windows, Garage Access
  • Foundation: Other
  • Roof: Flat, Rubber
  • Walls/Ceilings: 2 Story Ceilings, 9'+ Ceilings
  • Elevator(s ): 1
  • Stories Description: Lower 1, Main, Upper 1
  • Square Feet: 6,336
  • Sq. Ft. Source: Assessor
  • Living Area: 6,336 Sq. Ft.
  • Finished Above Grnd: 5,190 Sq. Ft.
  • Finished Below Grnd: 1,146 Sq. Ft.
  • Year Built: 2011
  • Year Built Source: Estimated
  • Property Condition: Excellent

Unit Information

Unit 1

  • Bathrooms-Lower: 1
  • Bedrooms-Lower: 1

Lot Features

  • Property View: Garden/Lawn
  • Lot Size (Acres): 0.52
  • Lot Size (Sq. Ft.): 22,492
  • Lot Size Source: Estimated
  • Zoning: R200

Financial Considerations

  • Price Per Sq. Ft.: $626.2
  • Assessment Year: 2026
  • County Tax: $15,820
  • County Tax Freq: Annually
  • Tax w/Assessment: $1,600,667
  • Tax Amount: $16,785
  • Tax Year: 2026
  • Terms: Standard Sale
  • Tax Total Finished Sq. Ft.: 6336

Disclosures and Reports

  • Ownership: Fee Simple
  • Lot Number: 6

Listed by TTR Sothebys International Realty, Ronald B Mangas Jr.
Sold by Serhant, Richard Michael Morrison and Serhant, Barak Sky

Listing agent

— 7405 Helmsdale Rd —

  • Ronald B Mangas Jr.

    TTR Sothebys International Realty

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NMLS#: 1598647

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NMLS#: 1598647

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Schools serving 7405 Helmsdale Rd

School District:Montgomery County Public Schools, Gaithersburg, MD
NameGradesDistance
Bannockburn Elementary School
6520 Dalroy Lane, Bethesda, MD 20817
K-51 mi
Thomas W. Pyle Middle School
6311 Wilson Lane, Bethesda, MD 20817
6-81.1 mi
Walt Whitman High School
7100 Whittier Boulevard, Bethesda, MD 20817
9-121.2 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 7405 Helmsdale Rd

Date
Details
Price
Change
Source
7/23/2026
Sold
$3,100,000
-4.62%
MLS
5/12/2026
Listed
$3,250,000
—
MLS
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Listed by TTR Sothebys International Realty, Ronald B Mangas Jr.
Sold by Serhant, Richard Michael Morrison and Serhant, Barak Sky

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7405 Helmsdale Road, Bethesda, MD 20817 (MLS# MDMC2233412) is a Single Family property that was sold at $3,100,000 on July 23, 2026. Want to learn more about 7405 Helmsdale Road? Do you have questions about finding other Single Family real estate for sale in Bethesda? You can browse all Bethesda real estate or contact a Coldwell Banker agent to request more information.