Heike Külper

BBT Treuhandstelle des Verbandes Berliner is a German company that has been a competent partner for over 30 years for various types of real estate companies, credit institutions, and municipalities. The company is based in Berlin, Germany, and has subsidiaries in Germany. It offers five areas of expertise with the goal of ensuring the success of its clients. The private company was founded in 1990, and the CEO is Kay Schulte.

Aktiva Haus- und Wohnungseigentumsverwaltung GmbH is a German Berlin-based company that has been managing all aspects of real estate since 1998. Aktiva Haus- und Wohnungseigentumsverwaltung GmbH is ultimately controlled by the Land Berlin Senatsverwaltung für Finanzen. The company's services include property management, leasing, and development. The company's philosophy is based on trust and competence, and they strive to provide optimal development of their clients' assets. The company also offers comprehensive management of residential and commercial properties. The CEOs of the company are Wilhelm Nieding and Ursula Siedenhans.

Horizont Wohnungsgenossenschaft Eg is a German company that leases apartments. The private company is based in Berlin, Germany. The company was founded in 2001.

Nordlicht Wohnungsgenossenschaft eG is a housing community that was founded in 2001. The private company operates as a housing community and is based in Berlin, Germany.