Management
Three investment management companies – one centre of competence for real estate.
Union Investment Real Estate GmbH
Union Investment Real Estate GmbH is Germany’s largest investment management company for open-ended real estate funds. The company’s management of real estate funds for private investors laid the foundation for its comprehensive property expertise. Union Investment Real Estate GmbH handles real estate asset management for the entire Group.

Dr. Michael Bütter
Chairman of the Management Board (CEO)
Areas of responsibility
- Coordination of the Management Board
- Coordination of company bodies
- Segment Management real estate strategy
- Real estate law
- Real estate communications and marketing
- Internal auditing
- Human resources/ Works councel
- General Administration
- Industry associations

Dr. Christoph Holzmann
COO and Member of the Management Board
Areas of responsibility
- Segment Management real estate operations
- Tax Management
- Participation Management
- Data Management, Reporting & Systems

Martin J. Brühl
CIO and Member of the Management Board
Areas of responsibility
- Investment Management
- Europe
- Asia/ Pacific
- Americas
- Retail
- Hospitality

Volker Noack
Head of Fund Management and Member of the Management Board
Areas of responsibility
- Fund Management
- UniImmo: Deutschland
- UniImmo: Europa
- UniImmo: Global
- Fund Support

Jörn Stobbe
Head of Asset Management and Member of the Management Board
Areas of responsibility
- Asset Management
- Germany
- Europe
- Overseas
- Retail
- Hospitality
- Real Estate Project Management
Short profiles of Union Investment Real Estate GmbH management team members
Dr. Michael Bütter, CEO
Dr. Michael Bütter has been CEO and Chairman of the Management Board of Union Investment Real Estate GmbH since 1 October 2020. As head of the Real Estate segment, he is responsible for coordinating Union Investment’s entire commercial real estate business.
His remit covers segment management (strategy), real estate law, communications and marketing. He is also responsible for HR and internal auditing and for industry associations and coordination of the company’s Management Board and corporate bodies.
Dr. Bütter is a fully qualified lawyer and business economist, having studied in Hamburg and Oxford. He has more than 20 years of experience in the real estate and private equity sector. During his career to date, Dr. Bütter has successfully held a number of management and supervisory board positions at various listed real estate companies including Vonovia SE, Scout24 AG, Immobilien Scout GmbH, TLG Immobilien AG and ADO Properties SA. He began his career as a lawyer and was a partner at Hogan Lovells LLP.
Dr. Bütter is a member of the supervisory and advisory boards of multiple real estate and digital companies. He also sits on the board of trade body RICS Deutschland and is a member of the executive committee of the German Property Federation (ZIA).
Dr. Christoph Holzmann, COO
Dr. Christoph Holzmann has been a member of the Management Board of Union Investment Real Estate GmbH since July 2020. As COO, he is responsible in particular for process optimisation, digital transformation and business management of the Real Estate segment.
He was previously Chief Financial Officer at Beos AG from 2016 to 2020, where his responsibilities included digitisation of processes and reporting on databases and business intelligence solutions. Prior to that, Christoph Holzmann held positions in finance, fund management, product development and real estate investment banking at a real estate asset manager, an investment management company and two banks.
Christoph Holzmann holds a business studies degree, an MSc in Real Estate and a doctorate. He is also a member of the Royal Institution of Chartered Surveyors.
Martin J. Brühl, CIO
In his role as Chief Investment Officer, Martin J. Brühl oversees all real estate transactions of Union Investment Real Estate worldwide. With assets under management totaling more than EUR 45 billion, Union Investment is a leading real estate investment manager providing a variety of investment solutions including non-listed retail and institutional open-ended funds, special funds and separate accounts.
Martin has close to 28 years of industry experience and has worked for groups like DTZ, Arthur Andersen and Cushman & Wakefield. Trained in banking and equipped with a degree in real estate appraisal and finance of City University Business School in London, Martin is Past President of the Royal Institution of Chartered Surveyors (RICS) and current Chairman of the Association of Foreign Investors in Real Estate (AFIRE) whose 215 member firms manage USD 3 trillion of real estate assets globally.
Volker Noack
Volker Noack has been a member of the Management Board of Union Investment Real Estate GmbH since 2010. Since July 2020, he is responsible for the management of the open-ended real estate funds UniImmo: Deutschland, UniImmo: Europa and UniImmo: Global such as the Fund Support.
Volker Noack has a degree in business administration and joined Union Investment Real Estate in 1996, working initially in the research section. In 2002, he joined the real estate financial control and expert appraisals team, subsequently serving as head of this department. Volker Noack was then head of the fund management department for three years, where his remit included managing the company's largest retail fund.
In February 2012, he took over responsibility for Investment and Asset Management International (Europe, France, America and Asia / Pacific) as Managing Director. Since January 2013, he has been responsible for the asset management and real estate project management Division.
Jörn Stobbe
Jörn Stobbe has been a member of the Management Board of Union Investment Real Estate GmbH and of Union Investment Institutional Property GmbH since spring 2017. He has been Chairman of the Management Board of Union Investment Real Estate GmbH from January to September 2020. His responsibilities include asset management of the company’s global real estate Portfolio with the regional units for Germany, Europe and Overseas and dedicated units covering Retail and Hospitality, with duties that comprise all the value-relevant activities in the real estate lifecycle. Stobbe is also responsible for the implementation and quality assurance of new build projects and for remodelling/extension work on existing real estate assets, all of which are handled by the Real Estate Project Management unit.
Jörn Stobbe has 20 years’ experience in international real estate transactions and asset management, He worked as managing director at RREEF Management GmbH and spent ten years as a partner at Clifford Chance.
Union Investment Institutional Property GmbH
Union Investment has been active in the institutional real estate sector since 1976. Union Investment Institutional Property GmbH, which is headquartered in Hamburg, focuses on real estate solutions (special funds, service mandates and pooling vehicles) for institutional Investors.

Jörn Stobbe
Member of the Management Board
Areas of responsibility
- Risk Management and Risk Controlling for open-ended and closed-ended real estate funds
- Compliance

Wolfgang Kessler
Member of the Management Board
Areas of responsibility
- Institutional Fund Management for open-ended and closed-ended real estate funds

Klaus Bollmann
Member of the Management Board
Areas of responsibility
- Securities transactions as part of real estate bundling solutions
- Sales
- Outsourcing Controlling
- Insourcing / Advisory Mandates

Dr. Christoph Holzmann
COO and Member of the Management Board
Areas of responsibility
- Institutional Property Solutions
- Fund Conception
- Outsourcing Controlling
- Insourcing / Advisory Mandates
- Anti-money laundering and fraud prevention
- Accounting of the GmbH and trade administration
Short profiles of Union Investment Institutional Property GmbH management team members
Jörn Stobbe
Jörn Stobbe has been a member of the Management Board of Union Investment Institutional Property GmbH since spring 2017. He is responsible for risk management and risk controlling for the open-ended and closed-ended real estate funds as well as compliance.
Jörn Stobbe has 20 years experience in international real estate transactions and asset management, most recently as managing director at RREEF Management GmbH. Prior to that, he spent ten years as a partner at Clifford Chance.
Wolfgang Kessler
Wolfgang Kessler has been a member of the Management Board of Union Investment Institutional Property GmbH since 2002 and is responsible for fund management for institutional real estate Investors.
Prior to joining the senior management team, Kessler, who has a degree in business administration, was head of real estate controlling, portfolio management and research at the company. Wolfgang Kessler studied property economics at EBS and is a chartered surveyor (RICS – Royal Institution of Chartered Surveyors). He previously held various positions in the real estate industry, focusing on property development, management and investment in the residential and commercial sectors.
Klaus Bollmann
Klaus Bollmann has been a member of the management team at Union Investment Institutional Property GmbH since February 2018, with responsibility for product management and sales. He is also a member of the management board of Union Investment Institutional GmbH, Frankfurt. Klaus Bollmann has over 20 years of experience in asset management and investment banking. He has a degree in economics and also holds an MBA from Berkeley, USA.
Dr. Christoph Holzmann, COO
Dr. Christoph Holzmann has been a member of the Management Board of Union Investment Institutional Property GmbH since July 2020. As COO, he is responsible in particular for process optimisation, digital transformation and business management of the Real Estate segment.
He was previously Chief Financial Officer at Beos AG from 2016 to 2020, where his responsibilities included digitisation of processes and reporting on databases and business intelligence solutions. Prior to that, Christoph Holzmann held positions in finance, fund management, product development and real estate investment banking at a real estate asset manager, an investment management company and two banks.
Christoph Holzmann holds a business studies degree, an MSc in Real Estate and a doctorate. He is also a member of the Royal Institution of Chartered Surveyors.
Union Investment Real Estate Austria AG
Union Investment Real Estate Austria AG is headquartered in Vienna. Its main product, immofonds 1, is targeted at private investors in Austria. The company manages real estate investments across the Austrian and German markets on behalf of its Investors.

Areas of responsibility
- Investment Management
- Fund Accounting

Areas of responsibility
- Fund Management
- Asset Management

Areas of responsibility
- Risk Management
Short profiles of Union Investment Real Estate Austria AG management team members
Dr. Kurt Rossmüller
Dr. Kurt Rossmüller has been a member of the Management Board of Union Investment Real Estate Austria AG (and its predecessor Immo Kapitalanlage AG) since 2005, with primary responsibility for investment management. He previously played a key role in establishing and developing the company.
Prior to becoming involved in real estate funds, he held various roles at Immoconsult Leasing Gesellschaft mbH, the development and finance arm of Österreichische Volksbanken-AG. This included setting up and implementing real estate financing projects, as well as developing and managing commercial real estate in Germany and various CEE countries.
Dr. Kurt Rossmüller is a member of the Royal Institution of Chartered Surveyors and a court-sworn and certified expert valuer for real estate.
Petia Zeiringer
Petia Zeiringer has been a member of the Management Board of Union Investment Real Estate Austria AG (formerly Immo Kapitalanlage AG) since 1 January 2021, with responsibility for fund management and asset management.
Petia Zeiringer has worked in the financial sector since 2001 and has been with the Union Investment Group since 2007, holding a number of positions. She served as a portfolio manager and head of multi-asset at Union Investment Austria GmbH until 2016 and was most recently head of risk management at Union Investment Real Estate Austria AG. Thanks to her long involvement in portfolio and risk management, Petia Zeiringer has broad knowledge and experience of the company’s business model, structure and products.
Alongside her work duties, Petia Zeiringer successfully qualified as a Certified Portfolio Manager (CPM) and a Certified Real Estate Investment Analyst (CREA®).
Manfred Stagl
Manfred Stagl has been a member of the Management Board of Union Investment Real Estate Austria AG (formerly Immo Kapitalanlage AG) since 1 July 2017 and is responsible for risk management and the middle office, as well as the legal, compliance and money laundering functions.
In addition, Stagl has been a member of the management team of Union Investment Austria GmbH (formerly VB Invest KAG) since 2006.
Alongside his long experience as managing director of an investment management company, Manfred Stagl has proven expertise in securities and asset management. He has in-depth knowledge of the international financial and capital markets, gained over many years, with roles including managing the treasury division of one of Austria’s largest banks, as well as several years serving on the board of a bank in the CEE region.