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  • 1586 Lexington Avenue

1586 Lexington Avenue, San Mateo, CA 94402

$4,498,000 Approx. USD 3 beds, 2 baths
2,190 sqft

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The Keaty Team REALTOR® - Sales Associate 714-608-3298 m
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Lic#: 01276603
NRDS ID: 187514104
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Lic#: 01276603
NRDS ID: 187514104
thekeatyteam@bhhscal.com Tustin Office
18302 Irvine Blvd, Suite 240
Tustin, CA 92780
Phone: 714-832-8800
Fax: 949-565-7700
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Tustin, CA 92780
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Listing Agent


Boyenga Team | homes@boyenga.com
Lic#: 70010882
Broker: Courtesy of Compass
Phone: 408-373-1660

Co Listing Agent


Graeham Watts | graeham.watts@compass.com
Lic#: 01466876
Broker: Courtesy of Compass
Phone: 650-308-4727

Agent Remarks

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 Details

Property type: Single Family Residence (Single Family)
Status: Active
MLS# ML82060534
Price: $4,498,000
Beds: 3
Baths: 2 (2 full)
Free Standing,Living Room,Wood Burning fireplaces
Built in 1956
2,190 sqft
0.20 acres
Lot size: 0.2021
County: San Mateo
Property style: Contemporary,Modern
Zoning: R10008
Construction: Steel
Interior features: Breakfast Bar
Appliances: Double Oven,Dishwasher,Electric Oven,Disposal,Ice Maker,Vented Exhaust Fan,Dryer,Washer
Parking description: Carport,Guest,Off Street
Heating/cooling: None
Heating description: Radiant
MLS area: 699 - Not Defined

Last Updated: 9/17/2026

 Days On Market (DOM): 17

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This listing belongs to the 699 - Not Defined MLS area

The style of this listing is Contemporary,Modern.
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Lat/Long: 37.524989, -122.353388.
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DISCLAIMER: There is NO WARRANTY, expressed or implied, for the accuracy of this information or its applicability to your financial situation. Please consult your financial and/or tax advisor. GET PRE-APPROVED The loan's interest rate will depend upon the specific characteristics of the loan transaction and credit profile up to the time of closing.

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