общая долевая собственность(This may not be an "official" English term, but 'tenancy in common" does not suit as it implies UNDIVIDED interest, whereas общая долевая собственность – per Russian law – is divided into shares (e.g. 1/3 held by one owner and 2/3 by another). Ivan Gesse)
совместное владение(In virtual machine self-service, the ownership model for virtual machines under which all members of a group can manage all virtual machines owned by any member of the group and the virtual machine quota, if one has been specified, applies to all virtual machines created by all group members)