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Dr. Lübke & Kelber GmbH is a real estate management company based in Frankfurt, Germany. Dr. Lübke & Kelber GmbH specializes in the management of land, buildings, and apartments. The German company was founded in 1968 by Konrad Lübke and is currently led by CEOs Marc Sahling, Jürgen F. Kelber, and Steffen Schaack.

Arbireo Capital AG is a German company that specializes in bundling real estate and capital market competence. The private company is based in Frankfurt, Germany. The company offers fund solutions and club-deals. The company was founded by Ralf Kind.

Buntes Wohnen Heilbronn GmbH & Co. KG aims to create a diverse living community where people with disabilities and individuals of all living arrangements can coexist. The private company is based in Heilbronn, Germany. The CEOs of the German company are Jürgen Franz Kelber, Steffen Potrafke.

ING Bank NV (Broker) (ING Bank-Broker) is the broker-dealer division of ING Bank NV, an investment bank headquartered in Amsterdam, Netherlands. It is a wholly-owned subsidiary of ING Groep N.V. (AMS: INGA; NYSE: ING), a Dutch multinational banking and financial services corporation. The firm was founded in 1991 through the merger of Nationale-Nederlanden and NMB Postbank Groep. ING Bank-Broker provides brokerage services to institutions, large corporations, and medium-sized companies.

FH Finanzholding AG provides investment services. The company is based in Hannover, Germany. The CEO of the German company is Mark Knobloch.