At the Councillor's

In Germany, the title of "Councillor" (Rath) can be purchased by those who achieve a certain eminence in their several walks of life, or it may be conferred as an honour by the Prince or King. The merchant who gives the name to this romance is thus "Councillor of Commerce," a compound word so unwieldy in English that the translator preferred to render "In the house of the Councillor of Commerce" by "At the Councillor's."
A.L.W.