§ 1219. Petition. The petition shall describe the property with respect to which the proceeding is instituted, the facts from which the court may find that the requirements of section twelve hundred fifteen of this article have been met and from which the presumptions set forth in section twelve hundred sixteen of this article may arise. It may include one or more items of property, as the attorney general may be advised, without prejudice to his right subsequently to commence proceedings relating to other items not included, provided, however, that when known owners or claimants are described as a class, the requirements of section twelve hundred seventeen (a) (i) of this article must be met.