Marianne Grosse

Grundstücksverwaltungsgesellschaft der Stadt Mainz mbH is based in Mainz, Germany. The company, Grundstücksverwaltungsgesellschaft der Stadt Mainz mbH, constructs and manages commercial and residential buildings and roads. It is ultimately controlled by the City of Mainz. It was founded in 1991 and the CEO is Franz Ringhoffer.

mainzplus CITYMARKETING GmbH is a private company based in Mainz, Germany that combines Mainz Congress, Mainz Tourism, and Mainz Culture to promote Mainz as a destination for tourism, culture, and conferences. The German company provides event venues such as the Rheingoldhalle, Electoral Palace, and Frankfurter Hof in the Old Town. The company was founded in 2012 and is led by CEOs Marc André Glöckner and Katja Mailahn.