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Olivier Mesmin

Olivier Mesmin

Partner

Paris

T: +33 (0) 1 44 17 77 69

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Biographie

Olivier intervient en fiscalité générale et internationale appliquée aux entreprises. Il concentre plus particulièrement son activité sur la structuration et la détermination de la stratégie fiscale des investisseurs français ou étrangers, institutionnels ou autres (structuration, audit fiscal, modélisations financières, négociations, et structuration de fonds d’investissement). Son savoir-faire et sa créativité dans le conseil fiscal aux investisseurs intervenant dans le secteur immobilier et hôtelier sont reconnues tant en France qu’à l’international. Conseil fiscal de la Fédération des Sociétés Immobilières et Foncières, il a participé à la conception, la négociation et l’évolution du régime fiscal des SIIC depuis 2003.

Engagements & distinctions

  • Legal 500 EMEA (France) 2026: Leading Partner in Property Tax.

  • Chambers & Partners France 2026: Band 2 in Tax:Real Estate.
  • The Best Lawyers in France™ 2027: Best Lawyer in Real Estate Law and Tax Law.

     

  • Décideurs 2025: Leading in Real Estate Tax; Excellent in Transaction tax and Highly recommended in Tax Litigation.

Affiliations professionnelles

  • Member of Federation des Sociétés Immobilières et Foncières
  • Member of the Institut des Avocats conseils Fuscous

€1 milliard

Olivier est intervenu sur la plupart des transactions supérieures à un milliard d’euros de ces dernières années.

Je n'ai que des éloges à faire à Olivier Mesmin ; il nous est d'une aide précieuse dans tous les dossiers que nous traitons. Olivier a une excellente réputation en matière de fiscalité immobilière et est un interlocuteur clé pour nous.

Citation Client, Chambers & Partners France 2026, Tax:Real Estate

Langues

  • English
  • French

Admission au barreau

  • Paris
  • England & Wales (Registered Foreign Lawyer)

Compétences

  • Corporate tax

  • Healthcare & Life Sciences

  • Renewables & Storage

  • Hotels & Hospitality

  • Real Estate

  • Tax & Private Client

  • Retail & Consumer Products

  • Infrastructure

  • Islamic Finance & Investment Team

  • Strategic Alternatives & Corporate Reorganization

  • Taxation of Corporate and Financial Transactions and Institutions

  • Real Estate Tax

  • VAT & Indirect Taxes

  • Corporate

  • Finance

  • Data Centers

  • Tax

Actualités

Voir toutes les actualitésIcon: arrow

Sectors in focus
Sep 09, 2026

Data center complexity goes beyond grid connectivity

Power is the pivotal factor for data center viability. AI and high-performance computing have pushed demand into the hundreds of megawatts, capacity is scarce, and grid connection dates are extending over several years. Diligence must test the connection date, reinforcement dependencies, security requirements, curtailment rights, expansion capacity and cost. An accepted offer is not the same as an energized connection.
Sectors in focus
Sep 09, 2026

Data center tenancy agreements - Routes to stabilization

The convergence of data sovereignty, security, power, cooling, connectivity, service agreements and AI-driven operational demands is transforming the traditional data center lease or co-location agreement into a hybrid instrument. Part real estate contract, part technology service agreement. This trend reflects the complexity of projects, number of stakeholders involved, and the pace of technological change. 
Sectors in focus
Sep 09, 2026

Growing data center disputes risk

The construction phase remains the most common source of high-value disputes in data center projects, and disputes here can disrupt delivery schedules, undermine revenue projections and strain key commercial relationships well beyond the immediate cost of the underlying issue. As builds become more complex, this risk escalates further. 
Sectors in focus
Sep 09, 2026

Hybrid power platform - The advantage of integration

The most advanced data center projects are moving beyond simply connecting to power and toward becoming integrated energy platforms in their own right — co-locating dedicated generation and storage with the data center itself. Here’s what you need to know. 
Sectors in focus
Sep 09, 2026

The new dynamics of data center site selection

With greenfield land limited and grid connection timelines long, developers are widening their search for data center sites, crossing borders and acquiring land previously considered too compromised to be viable. Developers are buying infrastructure platforms rather than merely acquiring and remediating contaminated land. 

Actualités

Sectors in focus
Sep 09, 2026
A comparative guide to the changing planning landscape for data centers
Sectors in focus
Sep 09, 2026
Compounding complexity in the data center build phase
Sectors in focus
Sep 09, 2026
Data center complexity goes beyond grid connectivity
Power is the pivotal factor for data center viability. AI and high-performance computing have pushed demand into the hundreds of megawatts, capacity is scarce, and grid connection dates are extending over several years. Diligence must test the connection date, reinforcement dependencies, security requirements, curtailment rights, expansion capacity and cost. An accepted offer is not the same as an energized connection.
Sectors in focus
Sep 09, 2026
Data center tenancy agreements - Routes to stabilization
The convergence of data sovereignty, security, power, cooling, connectivity, service agreements and AI-driven operational demands is transforming the traditional data center lease or co-location agreement into a hybrid instrument. Part real estate contract, part technology service agreement. This trend reflects the complexity of projects, number of stakeholders involved, and the pace of technological change. 
Sectors in focus
Sep 09, 2026
Growing data center disputes risk
The construction phase remains the most common source of high-value disputes in data center projects, and disputes here can disrupt delivery schedules, undermine revenue projections and strain key commercial relationships well beyond the immediate cost of the underlying issue. As builds become more complex, this risk escalates further. 
Sectors in focus
Sep 09, 2026
How to price grid uncertainty in data center energy contracts
Sectors in focus
Sep 09, 2026
Hybrid power platform - The advantage of integration
The most advanced data center projects are moving beyond simply connecting to power and toward becoming integrated energy platforms in their own right — co-locating dedicated generation and storage with the data center itself. Here’s what you need to know. 
Sectors in focus
Sep 09, 2026
The new dynamics of data center site selection
With greenfield land limited and grid connection timelines long, developers are widening their search for data center sites, crossing borders and acquiring land previously considered too compromised to be viable. Developers are buying infrastructure platforms rather than merely acquiring and remediating contaminated land. 
News
Jul 22, 2026
BCLP Advises SEGRO on £800m Joint Venture with Pure Data Centres Group