High above the shimmering waters of the Mediterranean, clinging to the steep cliffs of the medieval village of Roquebrune-Cap-Martin, stands a unique residential estate that bridges centuries of French history, high-fashion culture, and landscape architecture. Originally constructed as an almshouse for a local church, the multi-level sanctuary was transformed in the mid-20th century by the celebrated French decorator Raymond Poteau and his partner, legendary Vogue fashion photographer Henry Clarke. Today, the estate is owned and preserved by Los Angeles–based interior designer John-Mark Horton.
Horton’s connection to the home spans decades, beginning with childhood visits alongside his mother in the late 1960s. After acquiring the property at auction in the late 1990s, Horton undertook a comprehensive yet sensitive restoration. His work modernised the home’s infrastructure while painstakingly preserving its signature aesthetic: a harmonious blend of Roman and Hellenistic relief fragments embedded into plaster walls, 18th-century European tilework, and a cascading, trilevel garden acclaimed by historic figures including Princess Grace of Monaco.
Featured prominently in ELLE Decor, the estate serves as an enduring study in historic preservation, demonstrate how vintage Riviera properties can maintain their original, romantic character while accommodating contemporary living.
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| PROPERTY SNAPSHOT |
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| Location | Roquebrune-Cap-Martin, Alpes-Maritimes, France |
| Historical Origin | Medieval Church Almshouse |
| Key Custodians | Raymond Poteau & Henry Clarke (1950s–1996) |
| Current Owner | John-Mark Horton (Acquired 1996) |
| Architectural Style| Mediterranean Perched-Village Vernacular with Neoclassical, |
| | Provençal, and North African details |
| Garden Highlights | Trilevel terraced beds, converted Japanese granite basin, |
| | Sénateur Lafollette roses, night-blooming jasmine |
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Chronology of Transformation
The history of the Roquebrune retreat reflects the broader evolution of the French Riviera, transitioning from a medieval religious outpost to a mid-century artistic enclave, and ultimately to a meticulously preserved private sanctuary.
1950s Late 1960s 1980 1996 Late 1990s–Present
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Poteau acquires Young Horton Princess Grace Horton purchases Infrastructure updated;
former almshouse; first visits features garden property at Pasteur restoration preserves
expands garden with his mother in published book Institute auction Poteau's original design
The Early Origins and the Poteau-Clarke Era (1950s–1990s)
1950s: Raymond Poteau, an antiques dealer and interior decorator from northern France, purchases a modest, multi-level living space in Roquebrune-Cap-Martin that had historically served as an almshouse for the local church. Poteau begins acquiring adjacent agricultural terraced plots parcel-by-parcel from local villagers, transforming a utility produce garden into a structured, formal promenade.
Late 1950s–1960s: Poteau unites with Henry Clarke, an influential American fashion photographer renowned for his work with Vogue. Together, they expand the residence vertically and laterally, constructing a three-story annex separated from the primary home and creating a complex, hive-like layout characteristic of the village’s cliffside architecture.
Late 1960s: John-Mark Horton’s mother acquires a pied-à-terre in Roquebrune. During family vacations, young Horton regularly visits the Poteau-Clarke estate, forming early impressions of its hidden grottoes, terraced gardens, and dramatic Mediterranean views.
Transition and Restoration (1980s–Present)
1980: Princess Grace of Monaco formally documents the estate’s grounds in her publication My Book of Flowers, praising its intimate scale, carved niches, and dramatic coastal vistas.
Early 1990s: Horton re-establishes close ties with Poteau and Clarke during visits to Roquebrune while Poteau faces declining health.
1996: Following the death of Henry Clarke, the estate is bequeathed to the Pasteur Institute, which puts the historical residence up for public auction. Determined to prevent its unsympathetic re-development, Horton purchases the property.
Late 1990s–Present: Horton executes a multi-year structural overhaul, rewiring electrical systems, modernising plumbing, relocating the kitchen for functional flow, and curating an eclectic interior scheme that honours Poteau’s original vision.
Supporting Architectural & Horticultural Data
Structural Layout and Spatial Topography
The residence is embedded directly into the steep, rocky terrain of Roquebrune-Cap-Martin, positioned beneath a 10th-century castle. The village architecture functions as an organic, connected network—described by Horton as an "interconnected beehive"—where individual structures share structural walls, arched passageways, and rooflines.
Horton’s intervention focused on architectural conservation, preserving original decorative elements added by Poteau while introducing carefully sourced antique furnishings.
Tilework & Surface Treatments:
Entryways clad in mid-20th-century blue-and-yellow Portuguese tiles.
Bathrooms lined with authentic 18th-century French and Dutch ceramic tiles.
Main floor surfaces composed of regional clay tiles crafted by Les Terres Cuites des Launes.
Embedded Antiquities:
Fragmentary Roman and Hellenistic reliefs and carved stonework set directly into exterior and interior plaster walls.
An 18th-century French carved mirror framing the entrance hall.
Furnishings & Textiles:
Primary bedroom featuring 19th-century English hand-painted wallpaper paired with a 1950s mahogany bedside table.
Custom banquettes complemented by North African folding tables in the annex living area.
Bedding styled with natural mohair textiles sourced from the French Alps.
Botanical and Landscape Architecture
The trilevel garden represents a hybrid between structured French classical design and romantic Italianate decay. Plantings are configured to withstand the Mediterranean microclimate while providing continuous color, texture, and fragrance across seasons.
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| GARDEN ZONING & FLORA |
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| Terrace Level | Key Botanical & Structural Features |
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| Upper Terrace | • Raised beds lined with miniature boxwood hedges and clay tile|
| | • Massed plantings of white begonia & black monkey grass |
| | • Water feature: Converted Japanese granite basin fountain |
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| Main Level | • Specimen Cycads and citrus groves (Orange & Lemon) |
| | • Pink Oleander (*Nerium oleander*) and classic roses |
| | • Walled niches and antique terra-cotta storage urns |
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| Lower Level & | • *Sénateur Lafollette* climbing roses on iron dining trellises|
| Perimeter | • Night-blooming jasmine (*Jasminum noctiflorum*) along base |
| | • Cascading views overlooking the Bay of Monaco |
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Official Responses & Expert Perspectives
Primary Custodian Commentary
Reflecting on his decades-long relationship with the property, interior designer John-Mark Horton emphasizes the delicate balance between functional modernization and historical reverence:
"I did my best to keep as much as possible of what Raymond [Poteau] had done, because he had extraordinary taste. He’s the one responsible for all of the accreted detail, like the bits of Roman and Hellenistic art embedded into the walls… The entire village is one large, interconnected apartment building, like a beehive."
Addressing the logistical challenges of maintaining an historic cliffside home on the Côte d’Azur while based in Los Angeles, Horton notes:
"I keep thinking I should sell it, but I can’t bring myself to do it, because I would never be able to find anything like it again in my lifetime. I still remember the first time I returned, after my childhood, and walked through the living room out to the loggia, with the view over the garden and bay, and Monaco in the distance. It just took my breath away, and that still happens every time I go."
Historical Commentary
In her 1980 publication My Book of Flowers, Princess Grace of Monaco recorded her observations of the estate’s terraced gardens, highlighting their intimate scale and architectural charm:
"Small but precious… Its main charms are the small niches and grottoes where you happen upon a statue or come across a pot filled with geraniums."
Implications & Architectural Significance
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| HERITAGE & REAL ESTATE IMPACT |
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| 1. CONSERVATION OVER REDEVELOPMENT |
| Demonstrates the viability of restoring historic village structures without |
| gutting original architectural details or modernizing away historical character. |
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| 2. MICROCLIMATE-SENSITIVE LANDSCAPING |
| Serves as a reference model for Mediterranean terraced gardening, utilizing local |
| flora, scent-driven plant selection, and historical water conservation techniques. |
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| 3. CULTURAL PRESERVATION IN HIGH-VALUATION MARKETS |
| Preserves a rare mid-century bohemian estate amidst the intense commercialization |
| and modern architectural development of the surrounding Riviera region. |
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Preserving Character in High-Value Riviera Real Estate
The preservation of the Roquebrune sanctuary offers a compelling case study for historic residential conservation along the Côte d’Azur. In a regional real estate market often dominated by high-density modern developments and glossy contemporary renovations, Horton’s approach prioritizes "curated patina"—retaining old-world structural anomalies, historical tiles, and historic stonework.
The Dynamics of Medieval Perched-Village Properties
Restoring homes in medieval perched villages like Roquebrune-Cap-Martin presents distinct logistical challenges:
Structural Integration: Shared walls and interconnected foundations mean structural alterations require careful navigation of historic village footpaths and shared infrastructure.
Functional Adaptation: Original layouts—such as kitchens separated from dining spaces by multiple floors—require creative re-spatialization to meet contemporary standards without disturbing the building envelope.
Legacy of Mid-Century Riviera Enclaves
During the mid-20th century, the French Riviera became a haven for international artists, designers, and writers who acquired modest historical structures and transformed them into vibrant artistic retreats. By maintaining the combined vision of Raymond Poteau, Henry Clarke, and Princess Grace’s documented legacy, Horton ensures that this unique chapter of Riviera design history remains intact for future generations.
