§1. A juridic person is not to be a pastor. With the consent of the competent superior, however, a diocesan bishop, but not a diocesan administrator, can entrust a parish to a clerical religious institute or clerical society of apostolic life, even by erecting it in a church of the institute or society, with the requirement, however, that one presbyter is to be the pastor of the parish or, if the pastoral care is entrusted to several in solidum, the moderator as mentioned in can. 517, §1.
§2. The entrusting of a parish mentioned in §1 can be made either perpetually or for a specific, predetermined time. In either case it is to be made by means of a written agreement between the diocesan bishop and the competent superior of the institute or society, which expressly and accurately defines, among other things, the work to be accomplished, the persons to be assigned to the parish, and the Financial arrangements.
Source: Code of Canon Law (Vatican.va)