What are the residence requirements for an Italian investor visa holder to transfer to EU permanent residence?

I’ve read that there is no residence requirement for Italian investor visas, whether it is in the first 2 years of the card or in the 3 years of the card renewal. But my question is, if I want to apply for EU permanent residence in Italy, are there any residence requirements for these 5 years? Would I qualify for this as an investor visa holder?

Answers

On Alessia Ajelli answered:

To apply for PR after 5 years, you need to register also as resident with the City Hall; pass a language test; have filed tax returns in Italy with a yearly income exceeding € 8,500.

On Marco Mazzeschi answered:

To apply for PR after 5 years, you need to register also as resident with the City Hall; pass a language test; have filed tax returns in Italy with a yearly income exceeding € 8,500.