
San Mateo, California 94402
This Architectural Masterpiece is a Unique Collector-Grade Opportunity, listed at $4,498,000—positioned above the $3,935,998 Fair Market Value. While priced at a premium, the property features a Condition Rating of 2, reflecting a meticulous restoration of the historic X-100 prototype. With 32 feet of skylights, dual garden atriums, and panoramic mountain views, this home offers an unparalleled living experience. It is an ideal acquisition for Design Enthusiasts or Historic Preservationists seeking a singular, museum-quality residence in San Mateo.
Comparables within 1 miles sold in recently
| Address | Sold Price | Beds | Baths | Sq Ft | $/Sqft | Distance |
|---|---|---|---|---|---|---|
★ 1586 Lexington Avenue Subject | $4,498,000* List Price | 3 | 2 | 2,190 | $1,797 | - |
A 1360 Parrott Drive Sold | $4,030,000 | 5 | 3 | 2,665 | $1,512 | 0.8 mi |
* Subject property listed price vs sold prices of comps.
Property is new construction or fully renovated.
Although built in 1956, this iconic X-100 prototype has undergone a meticulous recent restoration. Key updates include a recoated foam roof, updated radiant heating, and refinished flooring. The kitchen and integrated architectural elements are in mint, collector-grade condition, meeting the criteria for a high-end renovation with no maintenance required.
The property has a large lot size, which is more than 4 times of its living area. lot size in square feet = 8803, living area = 2190.
As the historic X-100 prototype listed on the National Register of Historic Places, this collector-grade Mid-Century Modern masterpiece offers unparalleled prestige and long-term cultural value.
The steel I-beam construction eliminates interior load-bearing walls, creating a dramatic, light-filled environment further enhanced by 32 feet of skylights and dual private garden atriums.
The authentic preservation of signature materials like Formica and its specific architectural status may limit the buyer pool to specialized collectors rather than general luxury buyers seeking traditional high-end finishes.
At a list price of approximately $2,054 per square foot, the property commands a significant historical premium that may be difficult to justify through standard neighborhood comparable sales.
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.
No exterior & parking available.
Grades K-5 • 0.2 mi
Grades 6-8 • 2.4 mi
Grades 9-12 • 2.3 mi
No sensitive facilities data found.
| Feature | Subject | Average Home | Neighborhood Ranking (50 Listings) |
|---|---|---|---|
| Beds | 3.0 | 4.0 | 49% |
| Baths | 2.0 | 2.0 | 50% |
| Square foot | 2,190 | 1,880 | 60% |
| Lot Size | 8,803 | 6,300 | 78% |
| Price | $4.50M | $2.76M | 92% |
| Price per sq ft | $2.1K | $1.5K | 98% |
| Built year | 1956 | 1952 | 59% |
| HOA | $0 | $0 | 50% |
| Days on market | 38 | 106 | 3% |
Apr 29, 2026
$4,498,000
Initial Listing
Jul 9, 2003
$775,000
Public Record