Do they currently issue a Codice Fiscale (fiscal code) at the Moscow consulate if you indicate that it’s needed for buying an apartment? And without a Codice Fiscale can one obtain an Attestazione dei parametri (attestation of parameters) and a Nulla Osta (clearance / no-objection certificate)?
At the Moscow consulate they issued them without explanation — a friend booked an appointment, they processed it in front of her, free of charge, and didn’t require any justification at all. So using the purchase of an apartment as a reason shouldn’t be a problem — the requirements there are even more relaxed. I haven’t come across attestazione and nulla osta without the codice, but the logic is that the codice (codice fiscale — tax code) is needed at the notary stage of the transaction, not for the permits themselves.