 Apart from its general plan, the principal features which remain essentially intact from the original seventeenth-century building are the "piano nobile" (although largely redecorated) and one of Richini’s courtyards.The family oratory, also the work of Richini, and consecrated in 1671, was later turned into a private theatre for the use of the family and its invitees.The theatre, the oldest in Milan, is still in use as the "Teatro Litta di Milano", which also has a second performance space located in the old stable block.