Acar & Ergönen Law Firm > Istanbul, Turkey > Firm Profile

Acar & Ergönen Law Firm
Maslak Mah. Eski Buyukdere Cad. No:7
2000 Plaza Kat:17

Turkey > Dispute resolution Tier 4

Acar & Ergönen Law Firm is particularly well versed in handling real estate litigation, commercial litigation and shareholder disputes. The team is headed by skilled litigators Onur Ergonen, who ‘exudes confidence and competence in court’, and Duygu Acar Yucesoy.

Practice head(s):

Onur Ergönen; Duygu Acar Yücesoy


‘With a high level of expertise and always under the supervision of partners, the team is promptly delivering services.’

‘The team spends a significant amount of time in court and can suggest solutions based on court practices which is crucial.’

‘The partners can elaborate on the subjects with to the point examples and facts which makes it easier for us to make a decision about the issue.’

‘Their expertise and strong points enable them to fulfil clients’ advisory requests in many different areas. Their legal advice is tailor-made.’

‘Onur Ergönen is a strong litigator. He exudes confidence and competence in court. He is hard working and always prepared.’

‘Onur Ergönen’s handling of petitions makes even complex arguments easy to comprehend. The vast scope of his experience enables him to look at issues from various perspectives and leaves us fully confident that all aspects of the issue at hand have been carefully considered. Onur particularly excels in procedural issues.

Duygu Acar Yucesoy is a strong litigator. She is highly detailed-oriented and does not let up until all the i”s have been dotted and “t”s have been crossed.’ 

‘Duygu Acar Yucesoy is analytical and is able to break an issue down to its basic elements fast. Her passion about the case often fuels the team to strive even harder.

Key clients

Buyaka Shopping Mall

Keller Williams Regional Offices

Keller Williams Real Estate Agents

HSA Madencilik A.Ş.

Artell Yatırım İnşaat A.Ş.

Foreks Bilgi İletişim Hizmetleri A.Ş.

Octet Express

Multi Corporation Turkey

Gefco Turkey

Affidea Health Group

Hanwha Q Cells Corporation

Hanwha Solar One Hong Kong Limited

Çimtaş Boru İmalatları ve Ticaret Limited Şirketi

Keller Williams Turkey

Senvion Group


NEF Construction & Development


Bebek Turizm

İpek İnşaat ve Çakırkaya Jointe-Venture

Başar Başaran and Haşim Çağan Şentürk

Work highlights

  • Representing subsidiaries of Multi Corporation Turkey in mediation proceedings, and enforcement proceedings in various real estate law related disputes.
  • Representing Bebek Turizm in a litigation case against a governmental authority in a real estate dispute.
  • Representing two Turkish individuals in a multinational investment dispute.

Turkey > Commercial, corporate and M&A

Acar & Ergönen Law Firm bolstered its M&A practice with the arrival of Aslı Tezcan in February 2021.

Turkey > Real estate and construction

Acar & Ergönen Law Firm has a good track record of advising on real estate transactions, and particularly solid expertise in property-related disputes. Onur Ergönen and Duygu Acar Yucesoy head the department.

Acar & Ergönen is a law firm providing domestic and international clients with creative and effective solutions tailored to each client’s needs by handling legal matters with a result-oriented approach and assessing all possibilities and risks in a broad perspective.

Our firm renders consultancy, litigation, arbitration and alternative dispute resolution services to its clients in a variety of legal areas including, primarily, corporate and commercial law, mergers and acquisitions, contract law, foreign direct investments, tax law, employment law, intellectual property law, construction and real estate law and health law.

Our team consists of attorneys experienced in both dispute resolution and consultancy areas who are, therefore, competent in making accurate and effective risk assessments in line with our firm’s overall approach.

Duygu Acar Yü
Onur Ergö
Partners : 3
Lawyers : 10
Other staff : 3
IBA (International Bar Association)
Corporate Governance Association of Turkey (TKYD)
AHK Deutsche Handelskammer

CLIENT: Yiğitcan Bozoğlu – Head of Legal
TESTIMONIAL: Acar Ergönen is very easy to connect with. We trust their legal knowledge and they are always eager to deep dive into the legal issues when further input is needed. Their team works as a part of our in-house legal team and are always business oriented. Instead of one-size-fits-all solutions, they are ready to provide tailor made solutions and to present best legal option for each case.

CLIENT: Yiğitcan Erkan, Deputy General Manager COMPANY/FIRM: Buyaka Gayrimenkul Geliştirme ve Yatırım İşletmeciliği A.Ş.
TESTIMONIAL: Acar&Ergönen with its young and very experienced team is a very reliable, competent, creative, ambitious, honest, punctual, and well-organized law company maintaining its concentration in difficult times and very solution oriented in each case, which makes working with them very educational and instructive for us. As a property management company, Acar&Ergönen provides us a full range service including workshops, seminars and all kind of educational materials needed in retail sector, which makes us prepared for any possible challenges in current global market.

CLIENT: Coda Platform Limited
COMPANY/FIRM: Coda Platform Limited
TESTIMONIAL: We are privileged to be able to work with Acar & Ergonen Law Firm. They have supported us on various employment and corporate law matters. Their service is always prompt, professional and of a high quality and we are honoured to continue working with them.

CLIENT: Mustafa Kemal Tirifi, Financial Director of Lenzing Turkey and MEA
COMPANY/FIRM: Lenzing Elyaf A.Ş.
TESTIMONIAL: I`ve been working with Acar & Ergonen Law Firm for over 10 years and they are a very professional and experienced law firm in their field. We have cooperated in successful projects together but most importantly; they support their clients like business partners that ensure confident progress in business life. Having a reliable and professional consultant is vital to succeeding in business and therefore, I am very happy to work with them and hope that we will continue our cooperation for long years. I would like to express my sincere gratitude to Acar & Ergonen for always being there whenever I need their support.

CLIENT: Ahu Hacıömeroğlu Ergin – Director, Legal and Compliance at Multi Turkey Yönetim A.Ş.
COMPANY/FIRM: Multi Turkey Yönetim A.Ş.
TESTIMONIAL: I have been working with Acar & Ergönen Law Firm for more than 2 years. I am admired of their way of working. First, they specialized in their field so that they can provide efficient and timely legal advice that fits into the business requirements. Second, they are very good at understanding the needs of the client and accordingly they
provide tailor-made legal services with a pragmatic approach. Third but not the last, they are very professional, ethical and trustworthy. I strongly recommend them to everyone who seeks for the first-class legal service.

CLIENT: Ahmet Rauf Saatçi, Vice Chairman/BoD
COMPANY/FIRM: Keller Williams Turkey registered as Remo Emlak ve Gayrimenkul Hizmetleri A.S.
TESTIMONIAL: We have been using Acar&Ergönen legal capacity for all our legal work for the past 4 years. They are a well versed and forward-looking team; their work capacity has been phenomenal, and they are truly great partners with lots of experience. Always prompt to respond and keep us updated on the status of each issue we throw at them. We have worked with many attorneys over the years and Acar&Ergönen team truly outperformed many especially throughout the experience they have provided.

CLIENT: Başar Başaran
TESTIMONIAL: Acar&Ergönen is a blue-chip legal firm in Turkey. They are exceptionally strong litigators and creative in their strategic approach. They are tenacious and constantly come up with strong strategies as a case progress. They are very successful in coordinating multinational cases. With Acar&Ergönen, a client feels listened to and understood in detail. Their adaptation capability is great. Their analysis is thorough; their knowledge of other cases, especially Higher Court rulings is vast. Their team is selected carefully, and the service is impeccable at all levels.

CLIENT: Çağan Şentürk
TESTIMONIAL: Before starting our legal battle, we thought long and hard about what kind of a law firm to hire. Finally, our decision was to team up with Acar & Ergonen. Our legal battle became very complicated and international in time. As the complexity grew, so did the excellence of the guidance provided by Acar & Ergonen. At every step of our legal process, we have felt the confidence of being represented by a strong team. The service they provided us has always been exemplary. Without their professional legal assistance, I know we would have been at a disadvantage.

CLIENT: Emre Erol – Chairman/CEO
COMPANY/FIRM: Keller Williams Turkey and Northern Cyprus
TESTIMONIAL: Four years ago we decided to work with Acar & Ergönen Law firm because of their vast experience in real estate. They almost immediately understood and embraced our corporate culture, business models and systems that in return helped them to provide is exceptionally high standard and tailor made legal services. Today both through project and retainer based contracts in multiple legal practices, Acar & Ergönen – a team of well equipped and devoted counselors – has been playing a crucial role in our nationwide operations with thousands of associates. We are feeling very confident and looking forward for our future collaborations.

As part of its commitment to corporate social responsibility (“CSR”), diversity and inclusion (“DI”), Acar & Ergönen has recently launched a new programme called AE+, which aims to contribute to the society and the environment that we live in and to strengthen its inclusive and diverse culture. Acar & Ergönen targets enhancing its CSR and DI activities under AE+ to show its clients and team that it is much more than just being a law firm.

Corporate Social Responsibility.

Acar & Ergönen is aware of its potential social, economic, and environmental responsibilities, and keenly implements the CSR for a positive influence on the society and the environment.

Pro-Bono Work. Acar & Ergönen has always been conscious about its social and economic impact on the society, and therefore it has been rendering legal services free of charge to those economically less advantageous since its incorporation. Furthermore, Acar & Ergönen also gladly provides legal consultancy services to and sincerely advocates for Gıda Kurtarma Derneği.

Internship Opportunities for Law Students. The founding partners of Acar & Ergönen gained their very first legal experiences while they were law students, and therefore Acar & Ergönen gives utmost importance to contributing to the professional development of law students. Each year Acar & Ergönen hires at least one student as an intern to assist the team, and thus to get familiar with the legal practice.

Scholarships for Law Students. Acar & Ergönen believes that everyone should have equal access to education, and therefore it has been providing merit and need based scholarships to law students to enjoy their education in cooperation with Çağdaş Yaşamı Destekleme Derneği.

Environmental Contribution. Acar & Ergönen feels responsible for making the planet a better place for future generations and has started to track its environmental impacts to be able to take solid measures. Acar & Ergönen is in the process of working with an NGO that will help the firm to (i) measure and manage all the data that has to go in to managing the firm’s environmental footprint, and thus (ii) adopt new practices to reduce its carbon footprint.

Diversity and Inclusion.

Acar & Ergönen is committed to strengthening and expanding its inclusive culture and the diversity of its people. Acar & Ergönen focuses on professional qualities and humanity of its people, and welcomes any person of any gender, nationality, ethnic origin, sexual orientation, and religion.

Acar & Ergönen does not only believe in but also implements the gender equality in the composition of its organization. Equal gender distribution is reflected to all positions at the workplace, and accordingly %60 of the partners, %60 of the associates, 50% of the legal interns and 50% of the administrative stuff are women.