Independence
The foundations that make everything else possible.
What we do beyond Deep Tech
Some things cannot be explained by a business case, they can only be explained by a person.
The real estate portfolio that gives GDT its capital independence. The castle in Brandenburg that has become one of the more consequential meeting places in German technology. The art collection preserved when no one else would. These are not side projects. They are the material expression of a single orientation: that the things worth building take longer than any fund cycle permits, and that the obligation to build them does not expire with a mandate.
The pages below document what that looks like in practice and the person behind it is Marc Hildebrandt →
Real Estate
The financial foundation.
Over 70,000 sqm of owned real estate across Berlin, Potsdam, Leipzig, Dresden, and Brandenburg. This is not a real estate business. It is the capital base that allows GDT to operate with a time horizon no external investor would sanction. The assets compound. The mandate does not expire.
Historic Villas · Office Buildings · Industrial Sites · Agricultural Estates · Apartment Buildings
Art
Conservators of art, monuments, and nature.
When the Tacheles art center closed in 2012 — one of the defining cultural spaces of post-reunification Berlin — the works left behind were at risk of dispersal and loss. GDT preserved several hundred sculptures, paintings, and works on paper. Not as investment. As an obligation. The collection is held in Potsdam. Four publications have been produced. The collection focuses on Herbert Achterbusch, Andreas Schiller, and Alexander Rodin.
Der Tacheles-Schatz in Potsdam →
Publications
Andreas Schiller
global backup II
ISBN 978-3-7913-5579-5
Andreas Schiller
Wunderkammer des Abendlandes
ISBN 978-3-7913-3997-9
Schloss Fuerstlich Drehna
A castle in Brandenburg. A project measured in decades.
The Fuerstlich Drehna Water Castle is a listed moated castle in southern Brandenburg, located within the town of Luckau — 80 kilometres south of Berlin, 45 minutes from Berlin-Brandenburg Airport via the A13.
The castle dates to the 14th century, when it served as the seat of the Drehna lordship. Expanded and unified during the Renaissance, damaged in the Thirty Years’ War, restored under the Counts of Promnitz from 1697, and repurposed through the GDR era — Drehna has moved through history without disappearing from it. The castle park was designed by Peter Joseph Lenné in 1807 and remains largely intact.
In 2024, German Deep Tech Group acquired Schloss Fuerstlich Drehna and began a multi-phase restoration programme. The goal is not preservation for its own sake. The goal is to establish Drehna as a site of genuine significance — for technology exchange, applied research, and the kind of professional conversation that requires distance from the city and commitment to a longer frame.
Events at Drehna are by invitation. The Software Excellence Retreat, now in its fifth year, takes place here annually. Access to the programme is through the relationship.
