Heritage Level · Debut

KEYSTONE

Ref. 44B · Las Lomas, Boadilla del Monte · 2026

The first house signed by Heritage Level, alongside the architect Joaquín Millán.

Render

The geometry

The keystone

That debut rises in Las Lomas: a 2,000 m² plot shaped like a K that others dismissed for its geometry. Where the market saw a problem, Heritage Level saw an opportunity for authorship.

It does not hide that shape: it turns it into identity and makes the most of it. Hence the name of the project. KEYSTONE, the keystone that sets everything in motion in 2026.

The real perimeter of the plot, traced with its official coordinates. 2,000 m².

Wide view of the garden, the pool and the KEYSTONE pavilion at dusk

01 · The place

Where others saw a problem

Las Lomas, Boadilla del Monte. A plot that had been waiting a long time: its geometry put off anyone after an easy site. That is where authorship begins: in seeing the opportunity where others see the problem, and in keeping the best position in the area precisely because of it.

KEYSTONE seen from afar: the sloping planes of the roof over the stone colonnade

02 · The roof

A plane that folds

The roof of KEYSTONE is not a roof: it is a plane that folds. The pitches rise and fall following the geometry of the house, in matte black, and extend into overhangs that shade the porch and give the façade depth. The fifth façade carries as much intent as the other four.

Double-height living room of KEYSTONE, at night, with the fireplace lit

03 · The light

The house lights up from within

At night, the double-height living room becomes a lantern: the warm light draws the stone, the wood and the fire, and the great windows return it to the garden. The house does not switch on: it comes alight.

KEYSTONE dining room with the marble table and the spiral staircase beyond

04 · The materials

Materials that flow and converge

Corten steel, stone, travertine, gold-veined marble, wood. The finest materials flow and converge to give a singular identity, that essence which gives the project life and a purpose, with the respect that every material and every minute of work invested deserves.

Indoor spa of KEYSTONE with the pool and the waterfall wall

05 · The water

From the spa to the garden

A sheet of water accompanies the house inside and out: the indoor spa, with its waterfall wall, and the pool that melts into the garden. Water is not an extra: it is part of how every metre is lived.

The spiral staircase of KEYSTONE, with the glass lift beyond

06 · The signature

A house with an architect

KEYSTONE is developed alongside Joaquín Millán and his studio OOIIO, trained at OMA with Rem Koolhaas and at Foster + Partners, and named by Forbes as one of the 100 most creative Spaniards in the world of business. A signed agreement ties his authorship to the project: behind every decision there is a reason and a signature.

Form, geometry, silhouette, they matter. Our projects seek to convey emotion through architecture.
Joaquín Millán · OOIIO, in Arquitectura y Empresa

La ficha

KEYSTONE · Ref. 44B

Collection: Debut · Heritage Level
Location: Las Lomas, Boadilla del Monte (Madrid)
Plot: 2,000 m², shaped like a K
Architecture: OOIIO · Joaquín Millán
Volume: Two storeys above ground plus basement
Roof: Folded, of sloping planes, in matte black
Water: Outdoor pool and indoor spa
Materials: Corten, stone, travertine, marble and wood
Status: 2026 · project in development

The images on this page are recreations of the project produced from its renderings with digital tools. Non-contractual.

The terrace and pool of KEYSTONE at dusk, with the travertine steps lit

The beginning

KEYSTONE is only the beginning.

If you would like to get to know the project up close, let us talk.

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