The gracious Piazza Vecchia is surrounded by Renaissance public edifices, notably the Palazzo della Ragione with a medieval Torre del Comune.
The Palazzo della Ragione is a Renaissance public edifice. 
mnli hypothesis: The Palazzo della Ragione is a Renaissance public edifice.  premise: The gracious Piazza Vecchia is surrounded by Renaissance public edifices, notably the Palazzo della Ragione with a medieval Torre del Comune.