Bienvenido/ Welcome to TASSL

The Company

Our staff

TASSL is led by Monica Sapena, the founding partner. She is a Chartered Building Surveyor and holds a BSc on Design and Project Management.

During her 18 years in the Real Estate sector, she has acquired broad expertise on Development Management, Consultancy, Technical Due Diligence and Project Monitoring services providing advise in a number of major transactions in Spain and Portugal.

TASSL also counts with especialist M&E Engineers and Architects to support our client services.

Our history

Technical Advisory Services S.L. (TASSL) was founded in January 2012 and it is a firm Regulated by RICS.

Since its inception, the company has been providing Technical Due Diligence, Technical Asset Management and Development Management services to several investors such Standard Life Investments, Resolution Property, KKR, The Carlyle Group, Deloitte, Societe General, etc. 

We are based in Madrid but we work throughout Spain and Portugal.

Our services

At TASSL we provide the following services but we pride ourselves on providing tailored solutions to our clients and projects. 

  • Technical Due Diligence of Commercial Property
  • Project Monitoring for Financial Institutions and Investors
  • Development Management
  • Feasibility Studies
  • Technical Asset Management
  • Project Management
  • RICS measurements

Contact details

Email us or call our mobile

We are always out and about but if you prefer, we are very happy to set up a meeting with you at any time wherever you need us.


Cl Serrano 32, Madrid, Madrid 28001, Spain

650 49 37 29

Business hours


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