1586 Lexington Avenue, San Mateo, CA 94402

• 3 beds |
• 2 baths |
• 2,190 sqft

Property Description

A rare architectural offering, this one-of-a-kind 1956 Mid-Century Modern X-100 prototype, designed by an acclaimed team of architects, represents a pivotal moment in mid-century modern design. The home showcases six exposed steel I-beams, eliminating interior load-bearing walls and creating a dramatic open, light-filled environment with seamless indoor-outdoor flow. Thoughtfully restored while honoring its original vision, recent updates include fresh interior/exterior paint, recoated foam roof, refinished vinyl and concrete floors, updated radiant heating, curated furnishings, and refreshed landscaping. The home is organized around two private garden atriums with in-ground planting beds, while 32 feet of skylights flood the interiors with natural light. Signature materials, steel, glass, and Formica, highlight the home's authentic modernist character. Built-ins and kitchen elements are fully integrated into the architecture. Debuted in 1956, the X-100 gained national attention and influenced generations of modern residential design, set against the backdrop of Crystal Springs Reservoir. Listed on the National Register, this is a true collector-grade property ideal for design enthusiasts, historians, and those seeking a singular living experience. A legacy of visionary design.

Listing Status:

Active

Date Added:

September 17, 2026

Data Last Updated:

October 8, 2026 at 6:16PM

Listing Office:

Compass : (408) 358-1111

Listing Agent:

Boyenga Team : 408-373-1660

MLS ID:

ML82060534

Interior

• General: Breakfast Bar
• Appliances: Double OvenDishwasherElectric OvenDisposalIce MakerVented Exhaust FanDryerWasher
• Laundry: Gas Dryer Hookup
• Flooring: Tile
• A/C: None
• Heating: Radiant
• Fireplace: Free StandingLiving RoomWood BurningFireplace
• Disability Feature: OtherAccessible Doors

Exterior

• General: In Ground
• Style: ContemporaryModern
• Pool: FencedIn GroundAssociation
• Parking: CarportGuestOff StreetParking spaces: 2

Construction

• Roofing: Foam
• Windows: Skylight(s)
• General: Steel1Slab

Location

• HOA Amenities: ClubhouseFitness CenterBarbecueOtherPlaygroundPoolRecreation RoomTennis Court(s)
• Originating MLS: CRMLS_MLSL
• School District: Other
• County: San Mateo

Lot

• Zoning: R10008041044030
• View: HillsMountain(s)NeighborhoodView
• Fencing: Wood

Utilities

• Water: Public
• Sewer: Public Sewer

Financial

• Source: CRMLS_MLSL