Cologne: PROXIMUS and Quantum sell GERLING GARDEN to Deka

Cologne, 19/12/2025 | GERLING GARDEN is located in the heart of Cologne, on the site where insurance offices once shaped the cityscape and where the Gerling Group had its former headquarters. The joint venture between PROXIMUS and Quantum revitalised the southern section of the Gerling Quarter from April 2022 to June 2025. While preserving the historic building fabric, the ensemble was opened up to the city, expanded and reactivated. Upon successful completion of the project, GERLING GARDEN has now been sold to Deka Immobilien.

Following the addition of two or three recessed floors to the original three‑ to four‑storey buildings – creating generous rooftop terraces – and the construction of a directly adjoining five‑storey new building, GERLING GARDEN now comprises approximately 45,000 m² of gross floor area. This is divided across three legally and technically independent properties as well as an underground car park serving the quarter. The two office buildings “The Gate & The Hall” and “The Lime” provide a total lettable area of around 18,800 m². The 25hours Hotel “The Circle” offers 207 hotel rooms and, with publicly accessible spaces such as its rooftop terrace, restaurant and co‑working area, contributes to the openness of the quarter. The GERLING GARDEN concept has already attracted a number of well‑known tenants and is nearing full occupancy.

“GERLING GARDEN demonstrates how a city’s history can be preserved while simultaneously being boldly reimagined. We have carefully retained the site’s character and developed it in such a way that it is once again open, usable and vibrant. It is a quarter that strengthens Cologne in the long term – and one that we hand over to its new owners with great pride,” says Philipp Schmitz‑Morkramer, Member of the Management Board at Quantum.

“The revitalisation of GERLING GARDEN underscores our commitment to sustainable urban‑quarter development in prime locations. With its diversified concept and high occupancy rate, the property meets all the requirements of a modern investment product. The project demonstrates that even in challenging market conditions, buyers can be found for large‑volume core properties – buyers who value quality and make successful project developments possible,” adds Malte Boness, Member of the Management Board of PROXIMUS REAL ESTATE AG.

The parties have agreed not to disclose the purchase price. Colliers International acted as agent. The law firm Jebens Mensching advised the sellers, while REIUS. acted for the buyers.