Durán & Osorio Abogados Asociados > Bogota, Colombia > Firm Profile

Durán & Osorio Abogados Asociados

Colombia > Projects Tier 1

The team at Durán & Osorio Abogados Asociados has 'high knowledge, experience and exposure to complex transactions and regulatory developments', with the practice representing clients in public-private partnerships, privatisations and infrastructure projects. Álvaro Durán and Carlos Andrés Sánchez  jointly led in advising ISA on its strategy to enter in the Colombian road concessions market. Jorge Gabriel Taboada is noted for his expertise in infrastructure, government agencies and public transportation projects; Gustavo Osorio was part of the legal team that structured a PPP scheme for the water and sewage system of the city of Santa Marta; and Álvaro Gasca has advised public and private clients in the structuring and implementation of road and specialised urban transportation infrastructure projects. Gigliana Rivero Ramirez, Edgardo Maya and Felipe Herrera are also names to note.

Practice head(s):

Álvaro Mauricio Durán Leal; Jorge Gabriel Taboada; Gustavo Adolfo Osorio García; Carlos Andrés Sánchez García; Álvaro José Gasca Moreno


‘This firm compares favourably with other teams due to its extensive experience in this type of consulting and its excellent work.’

‘They have a great knowledge which allows them to provide complete and accurate advice. They help in an agile way in solving any problem that may arise and are available quickly to attend to the requests that are required around the project.’

‘For the evaluation of projects, I believe that Durán & Osorio is the best firm in the market.’

‘Team with high work capacity, high dedication to the client, experience and knowledge in the matters that are the object of the advice.’

‘Team with high knowledge, experience and exposure to complex transactions and regulatory developments, which makes them up-to-date in the different matters whose services are required. Álvaro Durán and Felipe Herrera stand out.’

‘Technically expert lawyers with great human qualities. Always ready to support the customer.’

‘Outstanding lawyers and with whom I had the opportunity to work: Gigliana Rivero and Carlos Sanchez: respectful treatment and with great technical capacity to address the issues covered in the contract.’

‘We actively have a relationship with two partners Jorge Gabriel Taboada and Álvaro José Gasca, who complement each other to achieve an excellent service. Jorge Gabriel Taboada provides us with knowledge and experience in contractual and corporate matters mainly. Álvaro José Gasca provides us with advice on contractual processes and preparation of bidding processes. As I mentioned, the joint work of both allows us to cover all areas of the processes and transactions with the partners.’

Key clients

Financiera de Desarrollo Nacional

Promotora Ferrocarril de Antioquia

Bid Invest

Financiera de Desarrollo Territorial (FINDETER) & Prosperity Fund



Empresa Férrea Regional

Agencia Nacional de Infraestructura

Empresa de Acueducto y Alcantarillado de Bogotá

Mercantil Colpatria – Unidad de Infraestructura

Work highlights

  • Advised Financiera de Desarrollo Nacional (FDN) and Empresa Metro de Bogotá (EMB) on the construction, operation and maintenance of Bogotá’s First Metro Line Project, regarding the tender process for the selection of the PPP contract supervision and the contractual requirements for the beginning of the PPP contract design phase.
  • Counsels Bid Invest on the legal structuring of the Magdalena River Waterway Project.
  • Advising ISA on its strategy to enter in the Colombian road concessions market.

Colombia > Public law Tier 1

The ‘stand out' team at Durán & Osorio Abogados Asociados is recommended for its strength and experience in structuring complex and sophisticated transactions across a wide variety of sectors, varying from transportation, energy and mining, and housing, to public finance, water and public utilities. Claiming a strong position in the Colombian legal market, the team advises a wide range of public entities and private companies regarding all matters of legal framework, including public contracting, tenders and auctions and PPPs. With unrivalled involvement in some of the most significant public procurement processes in the country, practice head Álvaro Mauricio Durán Leal led the team’s participation in the structuring of a PPP for the new Bosa Hospital and Bogota’s First Metro Line, as well as the PPP to build and maintain the infrastructure for the Bus Rapid Transit of Bogotá City. He is supported by Jorge Gabriel Taboada  who is renowned for his work in arbitration, both as counsel and a highly respected arbitrator; and public law expert Gustavo Osorio, who has more than 20 years’ expertise in public budget and contractual matters. Junior partner Álvaro Gasca and ‘exceptional professional' Carlos Andrés Sánchez García, who is based in the UK, make up the five-strong group who all co-lead the department, with well respected associate support completing the dedicated public law team.

Practice head(s):

Álvaro Mauricio Durán Leal; Jorge Gabriel Taboada; Gustavo Adolfo Osorio García; Carlos Andrés Sánchez García; Álvaro José Gasca Moreno


Their knowledge and experience in the infrastructure sector stands out. Having participated in various public initiatives adds value to their advice.

Knowledge and experience.

A good model and management of meetings, along with good management of online documents, in line with Covid-19 measures.

The team has extensive knowledge in the topics that were discussed, Dr. Taboada is an innovator in corporate governance issues and with extensive experience. During the pandemic, the work was carried out through virtual meetings and the team responded appropriately to it.

I recognise the efforts and work of Nicolás González, who with his short experience does a very good job.

Conceptual clarity based on experience that allows the client to understand situations and jointly envision solutions.

Conceptual clarity and willingness to address customer concerns. Senior associate Felipe Herrera stands out for his experience and excellent disposition to seek solutions and good manner with the client.

The Duran & Osorio team has extensive knowledge of public law and spectacular customer service.

Key clients

Financiera de Desarrollo Nacional

EDP Renováveis

Servicio Geológico Colombiano


Inter-American Development Bank – Fundación Corona – Swiss Economic Cooperation

Ministry of Transport (Ministerio de Transporte)

Ministerio de Tecnologías de la Información y Comunicaciones (MinTIC)

Findeter – UK Prosperity Fund

Fondo Nacional del Ahorro

Instituto Nacional de Vías

Empresas Públicas de Medellín

Work highlights

  • Advised Financiera de Desarrollo Nacional – FDN on the drafting of all the necessary documentation for the financing of Bogotá’s First Metro Line, as well as ongoing legal support.
  • Advise EDP on the analysis and application of Colombian regulations, environmental and labour requirements, consultations with indigenous communities, licenses and permits for the execution of inland wind farms in La Guajira, Colombia.
  • Legal advisor to Empresa Férrea Regional (EFR) on the performance of the concession agreement executed with Concesionaria Ferrea de Occidente (CFRO), for the construction and operation of the “Regiotram de Occidente” project.

Colombia > TMT Tier 1

Durán & Osorio Abogados Asociados’ six-strong practice group is co-led by Carlos Andrés Sánchez García and Álvaro Mauricio Durán Leal, who both advised the ICT Ministry on two of its most relevant projects: procuring a new registry operator for Colombia's top level domain and the auction of IMT radio spectrum. Other matters include the permanent representation of Servicio Geológico Colombiano (SGC) on the application of the legal framework and procurement processes. Another name to note is that of senior associate Gigliana Rivero Ramirez, who has ‘the expertise and knowledge to attend to issues’ and is a key member of the TMT-specialised team.

Practice head(s):

Carlos Andrés Sánchez García; Álvaro Mauricio Durán Leal


Durán and Osorio have a very good knowledge of telecommunications and their high degree of specialisation is evident. It is not knowledge derived from corporate transactions of telecommunications companies, rather, they know the detail of the regulatory aspects. The work we have done with them has been very good and they have responded quickly; I would not hesitate to collaborate with this firm on any TMT regulatory issue.

Without a doubt, their best quality is how they treat clients – it is sincere, fast and friendly. It also goes beyond the typical formality of the lawyer. They also have flexibility when it comes to pricing and their regulatory knowledge makes them stand out for when there is a specific need for TMT issues.

Communication with them has always been very good and I have noticed that there is a higher level of decision from lawyers who perhaps before had to consult things with a partner. This is the case of Gigliana Rivero who is more outgoing and fortunately they have given her a higher level of responsibility and more freedom to interact with clients. That is very good because she has the expertise and knowledge to attend to issues.’

Key clients

ICT Ministry (MinTIC)

Servicio Geológico Colombiano (SGC)

Microsoft Colombia

Hughes Network Systems / EchoStar Corporation

Work highlights

  • Advised the ICT Ministry on the structuring and the procurement of the registry operation contract for  Colombia’s top level domain .CO and its related matters.
  • Advised EchoStar on the registry of EchoStar XXIV before the Colombian government.
  • Advised the Servicio Geológico Colombiano (SGC) on the application of the legal framework and procurement processes.

Colombia > Banking and finance Tier 3

Market leading infrastructure and projects firm Durán & Osorio Abogados Asociados is a constant presence in the project-finance segment of the banking and finance sector, where it acts for a range of state entities, private consortia and local and international banks and finance entities. Co-founder and firm managing partner Gabriel Taboada can draw on significant public sector experience in banking and finance matters, having previously served as director general of the Securities Superintendency, of the Ministry of Finance's economic regulation unit, and of the Banking Superintendency. In addition, senior partner, Gustavo Osorio, also a former counsel at the economic regulation unit of the finance ministry, has 30 years' practice and considerable experience in the structuring of PPPs. It is, however, the pairing of younger partner Álvaro Gasca and senior associate Sebastián Duque that has been most active in the finance segment of late. 'Up-to-date, expert and agile', their recent work includes advising Empresa Ferréa Regional on both a $180m syndicated loan from Itaú Corpbanca, FDN and Bancolombia (for the development of the Transmilenio Soacha project), and on the structuring of a $475m securities program to finance the construction of the Regiotram de Occidente project; as well as acting as counsel to the FDN on the structuring of $428m financing of the 550Km, 5G La Dorada-Chiriguaná railway project.

Practice head(s):

Gabriel Taboada; Álvaro Gasca; Gustavo Osorio


The team is very committed to the transaction – they make it their own and that is positive.

Álvaro Gasca and Sebastián Duque were always at our disposal and ready to look for alternatives; our former firm did not do it badly, but I felt much more commitment from Durán & Osorio; integrating with the client is something fundamental and positive for them.

Up-to-date, expert and agile: Alvaro Gasca and Sebastian Duque.

Agility and simplicity in dealing with the client.

They are a unique team of lawyers. They are very comprehensive in all aspects of their advice to us. Compared with other legal advisors, they provide excellent service, where the client is always well cared for and satisfied with the tasks entrusted to and undertaken by the D&O firm.

‘Highlighted: the human quality of its staff; the integral nature of the consultancy (they have great knowledge on all the aspects of projects); the speed of attention and response; and personal attention from a partner of the firm and his team.’

‘The humane treatment, personal contact and quick assistance in all matters of legal advice. Collaboration on the client’s own tasks. Understanding the public function and its dynamics. Highly specialised in infrastructure projects.’

They are, without a doubt, the best project law firm in the country and that, in turn, has given them access to the most challenging financings in Colombia. They are creative, resourceful, and the partners are very attentive to always being available to their clients.

Key clients

Financiera de Desarrollo Nacional

Empresa Férrea Regional

Empresa Metro de Bogotá

Instituto de Infraestructura y Concesiones de Cundinamarca

Work highlights

  • Counsel to Financiera de Desarrollo Nacional and Empresa Metro de Bogotá on the structuring of the issuance of $725m in electronic promissory notes for the financing of Bogotá’s First Metro Line; as well as the follow up legal advisory on the credit agreements between Empresa Metro de Bogotá and the World Bank, the European Investment Bank and the Inter-American Development Bank, for a total amount of $1.68bn destined to the same project.
  • Advising Empresa Férrea Regional on the structuring and performance of a $420m securities program issuance for the financing of Regiotram de Occidente project.
  • Advising the Financiera de Desarrollo Nacional ion the structuring of the $475m financing operation for the La Dorada–Chiriguana Railway project.

Colombia > Energy and natural resources Tier 4

The team at Durán & Osorio Abogados Asociados advise on matters including energy generation, water resources, and in the construction and operation of public services utilities, and is recognised for its expertise in special regulations regarding energy and natural resources. Jorge Gabriel Taboada has extensive experience in the public sector, and Álvaro Gasca specialises in social and urban infrastructure projects.

Durán & Osorio Abogados Asociados was founded in Bogota, DC, in 1995. Since then, the firm’s practice has been focused on assisting its clients in obtaining legally, socially and economically efficient solutions for complex problems. Our lawyers are used to an interdisciplinary workplace and have developed investigatory skills that go above and beyond the reach of conventional legal training.

D&O provides services, as a leading law firm in every phase of the projects cycle. We provide council to the government for structuring complex projects, and to private parties for participating in biding processes, contract negotiations and developing unsolicited proposals of PPPs. We also advise the financing of projects, and we provide legal support to owners during their project’s execution. Our knowledge of the market dynamics and the financial fundamentals that characterize the projects’ field allows us to deliver comprehensive, viable and efficient solutions to our clients.

The firm is highly recognized as a specialized legal and regulatory advisor in the fields of public law, utilities, TMT, energy and mining, corporate and commercial law and is deeply involved in litigation concerning disputes related to all its areas of practice.

Main areas of practice
Projects: D&O is a leading legal advisor in Colombia for  the design, structuring, implementation and execution of large-scale PPP projects for public transportation, roads, social infrastructure, airports, ports, venues, railways, water and sanitation, and electric transmission lines.

Since its inception, D&O has provided legal advice both to the Colombian government and to private clients in connection with the most ambitious and emblematic infrastructure projects in Colombia. In 1998 the firm provided legal advice to the District of Bogotá for the design of Transmilenio, its world-wide praised BRT system. se The firm was also responsible for structuring the El Dorado Airport concession, drafting the PPP contract for the fourth generation (4G) concession program, and structuring a large number of 4G concessions. Of late, D&O structured Bogotá’s first Metro Line, a PPP scheme for the West Commuter Rail of Bogotá (known as “Regiotram de Occidente”), Bogotá´s Hospital Infrastructure Program -the first social infrastructure PPP project in the country´s history- as well as two hospitals through turnkey construction contracts, among many other projects.

Currently D&O participates extensively in the projects field as legal counsel for several road building, BRT and railway projects.

TMT: Durán & Osorio is considered one of the leading advisors for telecommunications, media and technology. The firm’s experience extends over the last 20 years, since the beginning of the market liberalization of TMT networks and services in Colombia, until the recent introduction to internet based services. Moreover, the firm has consolidated its image as a law firm that combines both legal and regulatory awareness, all while demonstrating a deep understanding of the technical idiosyncrasies and financial requirements of the industry.

Among many other cases, Durán & Osorio had the mandate to structure and execute the merger process between Colombia Telecomunicaciones and Movistar, which is possibly the biggest merger in Colombian history. During the 2019-2020 period, the firm advised the Colombian ICT Ministry in the structuring and procuring of the new registry operator contract for the Colombian top-level domain .co, as well as in the current concession contract extension negotiation, the IANA .co transfer request and the auction of IMT radio spectrum in the 700, 1900 and 2500 MHz frequency bands.

Energy and extractive industries: The firm is widely recognized for its practice in the energy and mining sectors in Colombia. The firm was the main legal advisor for some of the most significant projects in the energy sector in the country, including the acquisition of the hydroelectric power plant of Caldas, the energy corporation of Quindío, the acquisition of Transelca and the acquisition of equity in the Guavio hydroelectric plant, and also assisted Ecopetrol in its first stock democratization process in 2007. Currently, D&O advises the National Mining Agency of Colombia, and also supports several private clients in the development of alternative energy projects.

Water and sanitation: D&O pioneered the development of public-private participation schemes for the water and sanitation sector in Colombia. The firm was the main legal advisor for the process to grant in concession the Tibitoc water treatment plant in 1997 -probably the first concession contract of this kind in Colombia in modern times- and has being providing legal support to private clients in this area since the first PPP agreements with Colombian municipalities in this sector were signed,  25 years ago .

Among the most relevant projects for which D&O was the main legal advisor in this sector are a PPP for the water supply and sewage system of Santa Marta, and a PPP for the construction, operation and maintenance of the Canoas wastewater treatment plant. Currently D&O provides council to large public and private utilities, and also to several operators of waste managing concessions.

Public law: Durán & Osorio is regarded as a trusted and praised advisor in several areas of public law, including public procurement, public finance, regulation, public governance and punitive procedures.

Our public law practice is supported by all the firm’s areas, which allows us to provide our private clients with highly specialized advice in their relations with the Colombian government and in procedures before governmental entities. The firm’s public law team is very experienced and successful in regulatory matters, public procurement procedures, public finance, and governance of state-owned enterprises and public agencies in Colombia.

Currently, D&O advises several governmental entities and private companies on all matters related to their applicable legal framework, including public contracting, tenders and auctions, internal regulations, governance, audit and control.

Dispute resolution: D&O has an exceptional and steady record representing clients in court litigation, arbitration procedures, and in administrative investigations carried out by regulatory bodies and agencies in Colombia such as Superintendency of Public Utilities. The firm represents several large national and foreign clients in litigation concerning disputes related to public utilities, infrastructure, transport projects, toll road concessions and mining concessions, during every stage of judicial and arbitral proceedings, and provides its clients with strategic views and advanced negotiation techniques. The firm’s dispute resolution team is very experienced and possess extensive knowledge of both public and private law.

Banking and finance: The firm has a sound knowledge of financial markets and its regulations, delivering effective, innovative and cost-efficient solutions in debt and equity related transactions tailored to each client’s needs. Of late, the firm devised a unique long-term public debt instrument as a part of the payment mechanism (TPEs) for the Bogotá’s first Metro Line project, that entailed the largest public debt note emission in Colombia´s financial market history.

Currently D&O is developing a debt note emission scheme for the for La Dorada – Chiriguaná project and provides legal counsel for funding the Bogot a´s bus rapid transit system -Transmilenio- extension to Soacha municipality.

Projects Álvaro Mauricio Durán Lealamduran@duranyosorio.com
Projects Jorge Gabriel Taboada Hoyosjgtaboada@duranyosorio.com
Projects Carlos Andrés Sánchez-Garcíacarlos.sanchez@duranyosorio.com
Projects Álvaro José Gasca Morenoalvaro.gasca@duranyosorio.com
TMT Carlos Andrés Sánchez-Garcíacarlos.sanchez@duranyosorio.com
Energy and extractive industries Jorge Gabriel Taboada Hoyosjgtaboada@duranyosorio.com
Energy and extractive industries Álvaro José Gasca Morenoalvaro.gasca@duranyosorio.com
Water and sanitation Gustavo Osorioosorio@duranyosorio.com
Dispute resolution Álvaro Mauricio Durán Lealamduran@duranyosorio.com
Dispute resolution Jorge Gabriel Taboada Hoyosjgtaboada@duranyosorio.com
Banking and finance Jorge Gabriel Taboada Hoyosjgtaboada@duranyosorio.com
Banking and finance Gustavo Osorioosorio@duranyosorio.com
Total staff : 27
Partners : 5