In 1975, the year of European Heritage Conservation, Elisabeth Haub established the Erich Haub Zais Foundation for Monument Conservation in Wiesbaden. The foundation, named after her husband Erich Haub, who died in 1974, and his great-grandfather, Wiesbaden's master builder Christian Zais, was intended to express the Haub family's attachment to the city of Wiesbaden and at the same time be a lasting memorial to the important architect. Initially established with the aim of preserving the Platte hunting lodge from further decay, a general foundation was set up in 1975 to support private developers in particular with conservation projects in Wiesbaden.

The Erich-Haub-Zais-Stiftung works closely with the city's monument preservation authorities. The Lower Monument Conservation Authority manages the business of the foundation, whose board members include the Head of Urban Development, the President of the State Office for Monument Conservation and the Head of the City Planning Office. The respective Lord Mayor and a representative of the founding family sit on the advisory board of the Erich Haub Zais Foundation. The foundation's assets now amount to around €1.6 million, and only the interest is available for the projects.

To date, the Erich-Haub-Zais Foundation has supported the renovation of Freudenberg Castle, the restoration of the organ in the Luther Church and farmhouses in the suburbs, as well as contributing to the costs of restoring the Platte hunting lodge, for which a separate foundation was set up at the end of the 1980s. Construction work on the Russian Orthodox Church of St. Elisabeth was supported by the Erich Haub-Zais Foundation with a total of around DM 70,000.