The CRS information exchange comes from the financial institutions, not the tax offices.
The information shared is besides the (obvious) personal data, the account numbers and balances, capital insurances, the income out of interest - sales of securities stock etc.
So the ownership of property (registry/kadaster) is NOT communicated. But if someone has a life insurance with a mortgage, that would theoretically be possible to deduct.
Having said that, the tax authorities in my home country contacted me asking me why the property in another (EU) country was not reported?!