WHO WE ARE
A collective of senior real estate advisors with +15 years international experience across private equity, architecture, development and the luxury spheres. Advising private UHNW clients and family offices on strategic acquisitions, portfolio structuring & confidential high-value transactions.
We specialize in exceptional off-market assets : from luxurious residences signed by world-class architects, to heritage estates, investment-grade buildings, private châteaux & vineyards, art galleries and landmark hospitality properties. A confidential realm where capital, culture & architecture coexist.
We believe in Real Estate as a form of Art - where rarity, historical patrimonio & architectural craftsmanship endure across generations, held as a collector’s legacy. We combine bespoke advisory, advanced analytics and taste-led curation to help our clients secure rare and future-proof trophy assets.
BASED IN MADRID. OPERATING GLOBALLY.
MEET THE CIRCLE
OLIVIER CASTAGNE — SENIOR ADVISOR
Over 15 years advising UHNW clients across Europe and LATAM in prime acquisitions, negotiations and portfolio strategy — with a focus on off-market residential and investment-grade assets.
CÉSAR SANZ — RIVERWALK CEO
Leads Riverwalk's investment strategy, transforming prime assets into measurable, long-term value. Bridges finance, architecture and execution with investor-first discipline.
MARCOS TORREGO — RIVERWALK CAPITAL ADVISOR
Specialist in capital structuring and financial analysis for prime and value-add strategies. Brings clarity and risk-aware judgment to complex transactions.
AUDREY TASIAUX — SENIOR ADVISOR
Advises international clients on rare and design-led properties across global prime markets. Combines aesthetic sensitivity with disciplined negotiation and discretion.
MARÍA SANZ — CALIENZO CREATIVE DIRECTOR
Leads the creative vision at Calienzo, crafting quietly elegant spaces defined by proportion, materiality and light. Design rooted in permanence, calm and human experience.
JAVIER OSÉS — CALIENZO BRAND & CLIENT EXPERIENCE
Shapes the brand and client journey across Calienzo and Galeante, aligning service, narrative and long-term value. Focused on trust, refinement and relationships that endure.
WHAT DEFINES US
Proof over assumption. Certainty over risk.
Every recommendation is grounded in verified financial, technical & market analysis modelling