Sonar Development completes sustainable office revitalization in Berlin

Sonar Development has successfully completed the revitalization of Chausseestrasse 23 in Berlin-Mitte, transforming the office property into a modern, sustainable workplace. The building, part of an international real estate fund managed by Credit Suisse Asset Management, has been handed over to its new tenant—a public sector institution that has signed a long-term lease.

Ideally located near the ‘Naturkundemuseum’ underground station, the property benefits from excellent public transport connections, including tram and bus lines, and is in close proximity to Berlin’s central railway station, ensuring easy long-distance travel.

Originally built in 1998, the property has been under Sonar Development’s management since 2016. Following the departure of the previous tenant, Vattenfall, in 2021, the company implemented a long-term value-enhancement strategy, focusing on sustainability, modernization, and expansion. The building comprises two interconnected wings—a seven-story west wing and a six-story east wing—linked by a four-story structure that creates two newly designed courtyards.

As part of the refurbishment, Sonar Development completely upgraded the building’s technical systems, modernized all interior spaces, and enhanced the foyer. A key feature of the project was the addition of an extra floor, increasing the total leasable area by approximately 1,500 square meters. The underground car park was also redesigned with a focus on sustainability, incorporating charging stations for electric vehicles and bicycles.

“Our role as a local partner in asset management and transaction advisory for the previous Anglo-Saxon owners highlights the depth of value we create and the trust investors place in us,” said Nick Puschkasch, Managing Partner of Sonar Development.

With the successful completion and handover of Chausseestrasse 23, Sonar Development reaffirms its commitment to revitalizing existing properties through innovative strategies that create long-term sustainable value. The company remains focused on transforming outdated buildings into future-ready assets, ensuring their relevance and efficiency in a rapidly evolving real estate market.