From 1870 to 1875, Delbrück he was member of Vorstand in Association of German Chambers of Industry and Commerce.

He was buried in the Berlin Cemetery III of the Jerusalem and New Church in front of the Halleschen Tor.

His final resting place is the neoclassical wall tomb of his family.

Built of sandstone ashlars, the three-axis structure with red granite inscription plaques has a lattice enclosure.

[1] The dedication was extended in 2016 for the usual period of twenty years.