Central magistracy

Dear Colleagues,

Can somebody explain to me when the first central magistracy was built.

I have learned from a map, dated 1845, that the central magistracy was not standing on the same location as it is standing know. The present building was built in 1913. But from another map (from 1857) the magistracy was already on the place as it is today.

Would it be possible, that there was a second magistracy built perhaps already (one year later) in 1846 ?

Thank you very much for your kind help

Best regards,

Daniel