Which preposition to use with rossa

at Occurrences 1%

Byron, with the Countess and her brother, established themselves in the Villa Rossa at Monte Nero, a suburb of Leghorn, from which port at this date the remains of Allegra were conveyed to England.

in Occurrences 1%

Or, to take still another example, look at Guercino's painting of Cato's death, in the Palazzo Rossa in Genoa.

Which preposition to use with  rossa