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- Construction. Aleksandrów Kujawski: 1860–1862. Nowe Skalmierzyce: 1905–1906.
- 1879, Aleksandrów. On 4 September, the meeting of Tsar Alexander II with Emperor Wilhelm I in the “tsar’s rooms”. The year of the extension is also given as 1879 in V2, to be verified.
- 1918. The year from which V2 speaks of both buildings losing their former role after the border changes following the First World War.
Off the axis, date undetermined. Adaptation of the interiors in Nowe Skalmierzyce for workshops and warehouses: the V2 text says only “later”, and one of its diagrams adds “after 1918” without any date. That is why this event is not placed on the axis.
From the dates alone: construction in Skalmierzyce began 45 years after construction began in Aleksandrów (1905 − 1860). These dates show that this was not a single project.