He was appointed city architect on 29 October 1648, with retroactive effect from 1 August. His annual salary was set at 1600 guilders, quite a considerable at that time. Why Stalpaert was suddenly appointed city architect by the Amsterdam city council is unclear as he likely had never designed a building before.
Stalpaert was appointed city architect on October 29, 1648, with an effective date of August 1. His annual salary was substantial at that time, amounting to 1600 guilders. The reasons behind Stalpaert's sudden appointment as city architect by the Amsterdam city council are unclear, given his probable lack of experience in building design.