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

Durán & Osorio Abogados Asociados

Colombia > Projects Tier 1

Durán & Osorio Abogados Asociados’ impressive track record in major infrastructure projects scores highly with sources, who appreciate its ‘rapid ability to analyse a project’. The broad practice stands out for its adept handling of projects across all key infrastructure classes, including recent strong showings in rail, roads, healthcare, airport, and water and sanitation, among other market segments. High-profile specialist Álvaro Durán brings to bear pioneering experience in many of the country’s landmark infrastructure matters; he is currently leading the firm’s advice to Empresa de Acueducto y Alcantarillado de Bogotá on the structuring of the $1.3bn Canoas Wastewater Treatment Plant PPP. A former general director of economic regulation for the Ministry of Finance, Jorge Gabriel Taboada is also highly regarded. Other key contacts include Álvaro Gasca, who is particularly recognised for his experience in urban transportation projects. The group additionally draws on a deep bench of experinced senior associates, including Edgardo Maya, Sebastián Duque, Carlos Andrés Sarasti, Daniela Mejía and Felipe Herrera. Former senior Gigliana Rivero Ramirez  left the firm in July 2023, as did partner Carlos Andrés Sánchez.

Practice head(s):

Álvaro Durán; Jorge Gabriel Taboada; Álvaro Gasca


The team demonstrated a rapid ability to analyse a project — its conditions, particularities and needs — to structure the legal and contractual base to cement the project’s viability and guarantee significant progress in its execution.

Álvaro Gasca and associate Daniela Mejia led our project. Their interest in bringing the best practices and success stories associated with other projects was evident, designing a solution tailored to the needs of our project. Demonstrated professional and ethical rigour in their positions, relationships and deliverables.

We value the team for its collaboration and deal-closing.

Associate Felipe Herrera is very dedicated.

Key clients

China Harbour Engineering Company

Agencia Nacional de Infraestructura

Departamento Nacional de Planeación

Financiera de Desarrollo Nacional

Patria Investments

Empresa Férrea Regional

Empresa de Renovación y Desarrollo Urbano de Bogotá

Instituto Distrital de Recreación y Deporte

International Finance Corporation

Mercantil Colpatria

Financiera de Desarrollo Territorial (FINDETER) & Prosperity Fund

Concesionaria Rutas del Valle

Interconexión Eléctrica


Empresa de Acueducto y Alcantarillado de Bogotá (EAAB)

Inter-American Bank of Development

Ministerio de Obras Públicas de Panamá

Empresa de Renovación y Desarrollo Urbano de Bogotá

Work highlights

  • Advised International Finance Corporation and Panamá’s Ministry of Public Works on the structuring of Panama’s first PPP project, the $300m East Panama Road PPP.
  • Advised Empresa de Acueducto y Alcantarillado de Bogotá (EAAB) on the structuring of the $1.3bn Canoas Wastewater Treatment Plant PPP project.
  • Advised the Empresa de Transporte Masivo del Valle de Aburrá and Financiera de Desarrollo Nacional on the structuring of a public works contract for the construction and rolling stock procurement of Medellín’s third metro line, the 80th Avenue Metro Line of Medellín.

Colombia > Public law Tier 1

Satisfied clients of Durán & Osorio Abogados Asociados say it stands out for its ‘extensive knowledge of public law and private law’, which equips it to ‘solve public problems and propose viable solutions’. The group is additionally distinguished by its record in representing major government agencies and state-owned enterprises at home and abroad, including ANI, Ecopetrol and the UK’s Crossrail International. Álvaro Mauricio Durán Leal is a go-to public law specialist and recently advised IDB on the development of a framework analysing the different contractual functions of the contracts for the First Line of the Bogotá Metro and the Second Line of the Lima Metro. Durán co-heads the department alongside Jorge Gabriel Taboada, who is highly regarded for infrastructure and litigation; London-based projects expert Carlos Andrés Sánchez García; and Álvaro Gasca, who is particularly active in the PPP sphere. Senior associate Felipe Herrera provides capable support.

Practice head(s):

Álvaro Mauricio Durán Leal; Jorge Gabriel Taboada; Carlos Andrés Sánchez García; Álvaro Gasca


The group of lawyers formed and led by Álvaro Mauricio Durán Leal are nothing less than excellent.

The team possesses great depth of legal knowledge and good financial knowledge. Very practical in their reflections with technical equipment.

D & O’s work stands out from other teams due to its knowledge and experience, but above all due to its interest and capacity in public innovation. Partners have given direct support to innovative public procurement processes promoting the Social Impact Bond programme in Colombia.

Its teams have extensive knowledge of public law and private law, which allows connection and articulation to solve public problems and propose viable solutions.

We value lawyers for their very good availability, billing and excellent customer relationships.

The Duran & Osorio team provides constant theoretical-practical updates on current market trends, which allows them to address, analyse and solve issues, conflicts or difficulties in an avant-garde and innovative way.

We recommend the team for its high degree of both theoretical and practical knowledge of the markets and the commitment it presents to its clients.’

Key clients

Crossrail International / Ministry of Transport

World Bank

Financiera de Desarrollo Nacional

Patria Investments

Empresa Férrea Regional – EFR

Inter-American Development Bank

Mercantil Colpatria

Concesionaria Rutas del Valle

Ministry of Transport

International Finance Corporation (IFC)

National Roads Institute (INVÍAS)

Ministry of Finance and Public Credit


Servicio Geológico Colombiano

National Planning Department (DNP)

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

Work highlights

  • Advised IDB on the development of a theoretical and methodological framework analysing the different contractual functions (control, co-ordination and adaptation) of the contracts for the First Line of the Bogotá Metro and the Second Line of the Lima Metro.
  • Advised Mercantil Colpatria and Patria Investments on its successful tender for a major road infrastructure project; it is subsequently advising the concessionaire (Concesionaria Rutas del Valle) on the execution of the concession contract, and also on its contractual relationship with ANI.
  • Retained by Financiera de Desarrollo Nacional (FDN) to design a new institutional arrangement for the railway system in Colombia.

Colombia > TMT Tier 3

Leveraging its firm-wide strength in public law and projects, the practice at Durán & Osorio Abogados Asociados has a marked focus on advising TMT clients on regulatory issues and public contracts. The group -led by Álvaro Mauricio Durán Leal, who is recommended for infrastructure-related matters, including telecoms and technology-related procurement-is also equipped to advise on product development, data protection and dispute resolution. However, former practice co-head Carlos Andrés Sánchez and specialist senior associate Gigliana Rivero Ramirez  left the firm in July 2023.

Practice head(s):

Álvaro Mauricio Durán Leal; Carlos Andrés Sánchez


Excellent lawyers in public procurement and public law in general. Direct communication with partners and full availability in emergencies.

London-based Carlos Andrés Sánchez has extensive knowledge and experience. Also provides practical solutions and is business-oriented. Carlos is always available to help us when we need it and provides clear, precise legal analysis within the time required.

A great firm with innovative solutions, I worked with the team when I was in Colombia. It is very knowledgeable in this subject, and the partner’s attention is impeccable. I particularly highlight Carlos Andrés Sánchez in London.

Key clients

Hughes Network Systems – EchoStar Corporation

Hughes de Colombia

Microsoft Colombia

Agencia de Educación Superior, Ciencia y Tecnología (Agency for Higher Education, Science and Technology)

Servicio Geológico Colombiano (SGC)

Work highlights

  • Advising Microsoft on several matters related to regulation and public contracts, including on the execution of contracts with public entities for the implementation of solutions involving software licensing and cloud services.
  • Advising the Agency for Higher Education, Science and Technology on the structuring of the science, technology and innovation project to develop Bogota’s Vaccine Production Technological Development Centre.
  • Advising the Colombian Geological Survey (SGC) on the structuring of the Centre of Excellence in Earth Sciences project.

Colombia > Banking and finance Tier 4

Durán & Osorio Abogados Asociados’ premier projects offerings is reflected in its banking and finance practice, which specialises in representing sponsors and lenders — particularly multilaterals — in project finance transactions. Álvaro Gasca co-heads the practice and has an emphasis on infrastructure-related matters, with significant expertise in the transport sectors. Managing partner Gabriel Taboada co-heads the department and is recognised for his extensive public sector experience; he formerly served as head of the banks and financial institutions unit at Superintendencia de Valores, among other roles. Senior associate Sebastián Duque provides capable support.

Practice head(s):

Álvaro Gasca; Gabriel Taboada


The Duran & Osorio team constantly learns about the best cutting-edge market practices, which leads to a fast and close relationship with its clients with innovative and efficient approaches and solutions to problems.

We recommend the group for the quality of its lawyers, who demonstrate wide and deep knowledge of the sector.

D&O partners are directly involved in the mandates, bringing specific expertise as a mechanism to achieve agile processes and effective solutions. The team has a solid and in-depth knowledge not only of the applicable legal framework, but also of market conditions, key success factors, and risk factors in projects.

Álvaro Gasca stands out for his attention to detail, timeliness, compliance, and commitment to the client’s needs and project objectives. He manages to effectively incorporate the experience and strategy required for the successful execution of projects.

Durán & Osorio is characterised by having a group of excellent professionals with a capacity to creatively solve highly complex problems. The attention it provides to its clients comes directly from its senior partners and associates (the direct channel is never a junior).

The most prominent partner, and a benchmark in the sector, is Álvaro Gasca who maintains an excellent position to meet the needs of clients. Without being investment bankers, the team always has extensive financial knowledge which allows them to fully understand transaction and business structures.

Key clients

Financiera de Desarrollo Nacional

Empresa Férrea Regional

Empresa de Transporte Masivo del Valle de Aburrá – Metro de Medellín

Instituto de Infraestructura y Concesiones de Cundinamarca

Inter-American Development Bank

Ministerio de Hacienda y Crédito Público


Work highlights

  • Advised Empresa de Transporte Masivo del Valle de Aburrá – Metro de Medellín and Financiera de Desarrollo Nacional on a $500m syndicated loan agreement between Metro de Medellín (as borrower) and Banco Davivienda, Financiera de Desarrollo Nacional and Bancolombia (as lenders).
  • Advised Empresa Férrea Regional on the renegotiation of a $98m syndicated loan agreement with Itaú CorpBanca Colombia, Bancolombia and Financiera de Desarrollo Nacional.
  • Advised Instituto de Infraestructura y Concesiones de Cundinamarca on a $100m loan agreement with Bancolombia to fund the Plan 500 project for the construction and improvement of highway and roadways in the Cundinamarca Department.

Dispute resolution > Arbitration Tier 4

Regularly engaged by public and private companies, Durán & Osorio Abogados Asociados’ team is oriented towards arbitral disputes concerning public contacts. The wider firm’s top tier projects and public law offerings come into play here, with the group particularly active in infrastructure cases, including road, public transport, and real estate-related matters. Managing partner and department head Jorge Gabriel Taboada leverages his extensive public law expertise to specialise in projects-related disputes. The team also includes associate Sofía Leguizamón, who has a focus on dispute resolution. Associate Camila Angulo left for Baker McKenzie S.A.S. in January 2023.

Practice head(s):

Jorge Gabriel Taboada


D&O has participated in the structuring of the Bogota SITP concession contracts, since the creation of the granting company (Transmilenio SA), more than 20 years ago. Know the key players in the system, and their particular interests.

Gabriel Taboada, partner, has extensive knowledge and experience in structuring projects in the public passenger transport sector, in resolving conflicts and controversies.

Key clients

Agencia Nacional de Infraestructura (ANI)

Instituto Nacional de Vías (INVÍAS)

Aguas de Cartagena

Consorcio Ferrocol Santander

Unión Temporal Estructura Temporal 2019

Transinnova Usme

Smarbrix Espacios Modulares

Construcciones Rubau (sucursal Colombia

Work highlights

  • Represented Agencia Nacional de Infraestructura (ANI) in an arbitral procedure filed against it by concessionaire, Via Pacifico.
  • Represented Transinnova Usme in an arbitration process to solve a dispute between Transmilenio and concessionaire, Somos Usme regarding an alleged breach of contract by Transmilenio; Transinnova Usme is allegedly obliged to indemnify Transmilenio.
  • Advised Aguas de Cartagena (Acuacar) on an arbitration process involving the district of Cartagena de Indias.

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.

Department Name Email Telephone
Projects Álvaro Mauricio Durán Leal amduran@duranyosorio.com
Projects Jorge Gabriel Taboada Hoyos jgtaboada@duranyosorio.com
Projects Carlos Andrés Sánchez-García carlos.sanchez@duranyosorio.com
Projects Álvaro José Gasca Moreno alvaro.gasca@duranyosorio.com
TMT Carlos Andrés Sánchez-García carlos.sanchez@duranyosorio.com
Energy and extractive industries Jorge Gabriel Taboada Hoyos jgtaboada@duranyosorio.com
Energy and extractive industries Álvaro José Gasca Moreno alvaro.gasca@duranyosorio.com
Water and sanitation Gustavo Osorio osorio@duranyosorio.com
Dispute resolution Álvaro Mauricio Durán Leal amduran@duranyosorio.com
Dispute resolution Jorge Gabriel Taboada Hoyos jgtaboada@duranyosorio.com
Banking and finance Jorge Gabriel Taboada Hoyos jgtaboada@duranyosorio.com
Banking and finance Gustavo Osorio osorio@duranyosorio.com
Total staff : 27
Partners : 5