What really applies today: the pro-rata reduced allowance
§16(2) ErbStG in its current form says: the allowance under subsection 1 — the same 500,000 € for spouses, 400,000 € for children, 200,000 € for grandchildren, 100,000 € for the other persons in tax class I, 20,000 € for tax classes II and III — is reduced by a part-amount under limited tax liability. That part-amount corresponds to the ratio of the assets not subject to limited tax liability to the total assets acquired from the same person within ten years.
In plain terms: you receive the full allowance pro rata — in the proportion in which the German assets stand within the total acquisition. Anyone who leaves only a German property and nothing else is in a very good position. Anyone who also transfers substantial foreign assets sees the allowance shrink.
Legal position: ErbStG as in force, checked on 14 July 2026 (gesetze-im-internet.de). Whether the pro-rata reduction, too, is compatible with the free movement of capital is disputed and the subject of further proceedings — the last word has not been spoken here.