The foundation of Oude Gelderse Kerken (SOGK) is a foundation aimed at protecting old church buildings in Gelderland for closure and decay. By giving the buildings a new function and operating, or supporting the foundation's foundation, it is sometimes possible to help a church in need of financial support. As a result, a church can continue to fulfill its religious function while fulfilling a new task for the community. In this way, target groups like children can also meet church buildings.

The foundation manages several monumental churches, one synagogue and several towers in Gelderland. A local commission carries out the operation and promotion of the building in each of the locations. The SOGK has more than 1500 donors, for whom the foundation issues the quarterly window. Managed buildings Reformed Calixtuskerk Managed towers

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