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On the sign:
UMRISS DES UNVOLLENDETEN SPÄTSTAUFISCHEN WOHNTURMS UM 1240
DURCHMESSER DES FUNDAMENTS 21,75m MAUERSTÄRKE 6m GEPLANTE HÖHE ca 45m GRÖSSTER STAUFISCHER TURM DEUTSCHLANDS. VORBILDER IM FRANZÖSISCHEN KRONLAND
The sign, located in the Römerberg area, indicates the outline of an unfinished 13th-century residential building that was supposed to be the tallest in Germany.
Translation of the text on the sign: OUTLINE OF THE UNFINISHED LATE STAUFFIC RESIDENTIAL TOWER AROUND 1240
FOUNDATION DIAMETER 21.75m WALL THICKNESS 6m PLANNED HEIGHT approx. 45m LARGEST STAUFFIC TOWER IN GERMANY. ROLE MODELS IN THE FRENCH CROWN LAND