Jason Leung is a senior associate of Mayer Brown. He has experience in legal matters relating to the construction engineering and real estate development industry in Hong Kong and on mainland China. Jason advises clients on legal issues at different stages of a project cycle, including preparation and negotiation of development agreements, construction contracts and construction professional consultancy agreements, public and private tendering and procurement exercise, project management practices, claims preparation and challenge, termination of contracts, final account disputes, defects, delay and enforcement of warranties. He represents public bodies and private clients in court and arbitration proceedings.

Jason is also experienced in judicial review proceedings, building order appeals, health, safety and environmental regulations and enforcement actions. He was involved in public inquiries into excessive lead in drinking water in public housing estates and independent review in a heritage building collapse in 2016.

Jason participated in the Hong Kong Judiciary’s working group for the Practice Direction for an e-Discovery Pilot Scheme published in 2014.

Jason is admitted in Hong Kong. Prior to his admission, Jason obtained a bachelor degree in civil engineering in Hong Kong.

Spoken Languages

  • English
  • Chinese


Contentious Construction Matters

  • Acted for the Hong Kong SAR Government defending claims from main contractors in arbitration in relation to several major infrastructure, public utilities and roadwork projects in Hong Kong.
  • Acted for a listed company defending a High Court claim from a sub-contractor on final account issues in a public roadwork project in Hong Kong.
  • Acted for a leading charitable organisation on design and construction issues in geotechnical works in a site formation project in China and represented that organisation in mediation and arbitration proceedings against the designer and project manager.
  • Acted for a quarry operation in an arbitration in Hong Kong arising from a quarry rehabilitation contract. This claim involved expert evidence on various disciplines including delay analysis, quantum, geology/construction material and quarry management.

Administrative Proceedings and Inquiries

  • Acted for a major PRC stated-owned construction company in a Commission of Inquiry into the excess lead found in drinking water in public housing estates in Hong Kong in 2016.
  • Acted as a member of an independent review on a collapse of a heritage building in 2016.
  • Acted for a building owner of a purpose-built industrial premise in an appeal against a building order and subsequently represented the owner in judicial review proceedings against the appeal tribunal's determination.
  • Acted for building owners in judicial review proceedings relating to development restrictions imposed in the outline zoning plan by the Town Planning Board.

Regulatory and Enforcement

  • Advised and defended employers in a number of industrial summonses under the Factories and Industrial Undertakings Ordinance (Cap. 59), Occupational Safety and Health Ordinance (Cap. 509) and Gas Safety Ordinance (Cap. 51).
  • Advised a charitable organisation on a comprehensive review of the regulatory framework and compliance issues on waste disposal.
  • Advised a charitable organisation on various issues relating to fire safety in its premises and water pollution control in its operation.
  • Acted for a public transport operator in relation to a noise abatement notice under the Noise Control Ordinance (Cap. 400).
  • Advised companies in the construction industry on a potential competition investigation under the Competition Ordinance (Cap. 619).

Non-contentious and Advisory Matters

  • Advised a public authority in the drafting of tender documents for the supply and installation of combined heat and power generators in a hospital in Hong Kong.
  • Advised a public authority on BIM provisions in the development and construction of a new hospital in Hong Kong.
  • Advised a worldwide charitable organisation in the preparation tender documents for renovation works in a natural conservation project in Hong Kong.
  • Advised a major developer in Hong Kong on a commercial agreement with an International data centre and colocation provider on the construction and fitting out of a data centre in the New Territories, Hong Kong.
  • Advised a major blue-chip developer in relation to defects found in stone facade works.
  • Advised a major developer on liquidated damages issues arising from a development agreement in a residential development in Hong Kong.
  • Represented a tertiary education institution in Hong Kong on termination of consultancy agreements and determination of the employment of a contractor under a contract for renovation works.
  • Advised a major theme park in Hong Kong in relation to determination of the employment of a contractor under a contract for renovation works.
  • Advised in various merger and acquisition transactions involving construction and engineering projects.


The University of Hong Kong, PCLL

The University of Hong Kong, LLB

The University of Hong Kong, Bachelor of Engineering, CivE-Law


  • Hong Kong