Grey house
The Grey House is the biggest of the houses around the Main Square in Krakow, built at the turn of the 13th and 14th centuries, and inscribed on the Register of Historical Monuments in Krakow in 1936.
This huge, four-storey building is crowned with an intricately ornamented attic and reinforced at the corner with a buttress. It has stunning Gothic vaulting and Renaissance ceilings. Its splendid, monumental western façade, rhythmically segmented into six by pilasters the full height of the three upper storeys, dates from the 18th century, and the imposing Baroque portal was inserted by the Castelli family. The ceiling of one of the ground-floor rooms is decorated with polychromy by the Young Poland artist Jozef Mehoffer.
Over the centuries some of the most illustrious visitors to the house have included the first elected king of Poland, Henri de Valois (in 1574), and the country’s last king, Stanislaw August Poniatowski (in 1787). The building also served as the headquarters of the insurrectionist leader Tadeusz Kosciuszko (in 1794, prior to the Battle of Racławice) and of a later insurrectionist authority, the Provisional Government of the Krakow Uprising (in 1846).
Since 1993 the building has been the property of the Grey House Szara Kamienica Foundation. In recent years the Foundation has completely renovated the house throughout, using state-of-the-art construction technologies.  
Today the palace functions as a mixed-use commercial and residential complex with office space for large and medium-sized companies, as well as apartments for the most discerning of individual clients.

The ground floor is occupied by the Szara restaurant, which fronts onto the Main Square, and by luxury boutiques accessed from Sienna Street.