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On the sign:
MŰEMLÉK KLASSZICISTA STILUSÚ ÉPÜLET VOLT FESTETICS PALOTA ÉPÜLT 1826-27-BEN POLLACK MIHÁLY TERVEI SZERINT
The next photo taken on the same day shows the building and the place of the sign on it Click for a larger image
Translation of the text on the sign: MONUMENT THE CLASSICIST BUILDING WAS A FESTETICS PALACE BUILT IN 1826-27 ACCORDING TO THE DESIGN OF Mihály Pollack