real estate needs tailor made solutions

Aggregate Financial Services

We are a member of the Aggregate Group, founded to serve with excellence, innovation and team spirit.


billion EUR

real estate financing track record

team members

to structure and arrange the most efficient financing solutions

competence areas

corporate finance, capital markets, structuring, institutional client coverage

About us

As an independent financial advisor, we focus on providing customised solutions to meet the financial requirements of our clients. The team consists of specialists with decades of experiences and expertise from various positions held with international investment banks and law firms.

The combination of our corporate finance, capital markets and structuring expertise as well as our in-depth understanding of real estate fundamentals and clients’ needs allows us to deliver on what we promise.

Our passion for innovative solutions is the most precious asset to outperform the industry standard. We work hard to establish and maintain a high responsive and concentric relationship with our business partners.


Johannes Märklin

Managing Partner

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Johannes worked for 25 years in the German banking industry. He co-founded Aggregate Financial Services.

Previously he was running Deutsche Bank’s Private Debt Syndicate business for its Corporate Finance and Debt Capital Markets division with teams in Frankfurt, London, Singapore and Tokyo. In his roles, Johannes developed the financing activities for international corporate clients, including real estate companies and financial institutions and expanded the distribution activities of capital market products to institutional investors across Europe and Asia. Johannes holds a German diploma in Business Administration and a MBA from University of Wales.

Johannes is married and has 4 children.

Nadja Hoppe

Corporate Finance

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Nadja has more than 8 years of corporate finance experience with a focus on debt advisory and real estate transactions. As Director in Aggregate’s corporate finance team, she is responsible for advising clients on structuring and arranging financing solutions.

Prior to joining Aggregate, Nadja advised and executed corporate finance and restructuring transactions at NAI Apollo, PricewaterhouseCoopers and Deutsche Bank.

Nadja earned a German Diploma in Economics from the Leibniz University of Hanover.

Sebastian Ernst

Managing Partner

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Sebastian has over 18 years financial services industry experience. He co-founded Aggregate Financial Services in 2018.

Previously Sebastian was a Managing Director and Global Head of Illiquid Credit Trading at Deutsche Bank. He was responsible for the underwriting and structuring of financing transactions and the trading of illiquid bonds and loans with a focus on corporate and real estate related credit risk.

He holds a Masters degree in Business Administration from the University of Passau. Sebastian is married and has 3 children.

Matthias Sandfort

Banking Coverage

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Matthias has more than 20 years experience in various roles and positions in the real estate market. As Managing Director, he is responsible for banking coverage.

Prior to joining Aggregate Financial Services, Matthias worked for NATIXIS, Helaba and WestLB. During his 6 years as department head for international real estate restructuring (US, UK and European portfolios) at Helaba, he gained significant experiences in turnaround, restructuring and operational / performance improvement consulting. Previously, Matthias focussed on real estate lending in Central and Eastern Europe and as Head of Western Europe. Matthias is married and has 3 children.

Benjamin Uhde

Corporate Finance

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Benjamin is Executive Director in Aggregate’s corporate finance team and responsible for advising clients in real estate financing solutions. He has 13 years of corporate finance, capital markets and private equity experience where he worked as corporate finance advisor, real estate sector banker and as senior financial analyst for a publicly listed real estate company.

His transactional experience comprises of equity and debt capital markets transactions, private equity and debt, structuring, arranging and placement of senior and junior loans for developments as well as real estate portfolio in Germany, Austria, Switzerland, the Nordics and South East Europe. Benjamin has graduated with Master of Arts in Finance. He is fluent in German, English, French, Italian and Spanish. Benjamin is married and has 2 children.

Michael Rützel

General Counsel

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Michael heads the legal department of Aggregate. Before joining, he worked for 15 years with White & Case, Barclays Capital and Deutsche Bank in various capital markets, regulatory and structured finance teams where he focused on real estate financing and securitizations for banks and private equity companies.

Michael is admitted as a German lawyer and as a solicitor in England and Wales. He is a regular lecturer at the German Graduate School of Management and Law on Legal Tech and Project and Process Management and a speaker at industry events.

Martin Bielefeld


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Martin has joined Aggregate Financial Services GmbH in 2019. He is responsible for structuring financial solutions. He previously worked for Deutsche Bank’s Private Debt Syndicate. Before joining Deutsche Bank in 2006, Martin has worked for Morgan Stanley in London and Clifford Chance in Frankfurt and London. Martin is a qualified lawyer in Germany and a solicitor of England and Wales.

Johannes Kaiser

Client Coverage

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Johannes is responsible for institutional client coverage and in charge of new technologies and tools for Aggregate Financial Services. Prior to joining Aggregate, Johannes worked for 10 years in the capital markets divisions of Deutsche Bank and Macquarie Group where he focused on the coverage of institutional and corporate clients. Preceding his career in the financial industry, Johannes was a professional cyclist.

Johannes completed his studies of Engineering and Economics and owns a diploma in Industrial Engineering from the Technical University of Ilmenau.

Nicholette Fung

Office Manager

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Daniela Spies

Portfolio Management

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Daniela is Executive Director and responsible for the Aggregate Portfolio Management. She has 24 years of experience in real estate banking in various roles. Before joining Aggregate Financial Services Daniela worked for NATIXIS, WestLB and LBBW. Prior to 3 years Portfolio management with NATIXIS Pfandbriefbank Daniela headed the Westdeutsche Immobilienbank Real Estate Representative Office in Paris.
Her transaction experience ranges from German construction financing and project developments to LMA-senior/junior billion EUR/USD transactions in the US, CEE and France.
Daniela is Real Estate Investment Advisor (EBS) and speaks German, English and French.