§1. Without prejudice to the prescript of can. 638, §3, when the value of the goods whose alienation is proposed falls within the minimum and maximum amounts to be defined by the conference of bishops for its own region, the competent authority is determined by the statutes of juridic persons if they are not subject to the diocesan bishop; otherwise, the competent authority is the diocesan bishop with the consent of the finance council, the college of consultors, and those concerned. The diocesan bishop himself also needs their consent to alienate the goods of the diocese.
§2. The permission of the Holy See is also required for the valid alienation of goods whose value exceeds the maximum amount, goods given to the Church by vow, or goods precious for artistic or historical reasons.
§3. If the asset to be alienated is divisible, the parts already alienated must be mentioned when seeking permission for the alienation; otherwise the permission is invalid.
§4. Those who by advice or consent must take part in alienating goods are not to offer advice or consent unless they have first been thoroughly informed both of the economic state of the juridic person whose goods are proposed for alienation and of previous alienations.
Source: Code of Canon Law (Vatican.va)