Palazzo Grassi, together with Casa Isolani and Casa Reggiani, is one of the few surviving examples of Medieval urban configuration built in the 13th century Romanesque style. The portico in front is supported by wooden beams, in the typical "crutch-shape", and structures covered with baked bricks. Once the portico used to covered the entire construction on the front facade, but during the radical restoration works (1897-1909) it was for reasons of traffic and conservation reduced to its present size. The main gateway is solid construction in terracotta, preserving a pointed arch lintel and one-light small window.
Once belonged to the priests, was bought by Grassi in 1466 and remained in their ownership until 1848, i.e. when the Bolognese branch of the family became extinct in the male line. Today it is the seat of Circolo Ufficiale dell'Esercito of Bologna (the army officers club).
One of the few mediaeval buildings to survive intact, il Palazzo Grassi dates from the 13th century. It was built as the residence of the prominent Grassi family and was lavishly decorated with frescoes in its interior. As was typical at the time of its construction, the palazzo's portico is supported by original wooden pillars and beams, while the red brick façade contains several windows in its upper floor, each with a slightly different terracotta decoration. The building was restored in the early 20th century and became the headquarters of the Circolo Ufficiali di Presidio, the Officers' Club.