A petition for detachment of territory from a special charter district with annexation to another school district, for detachment of territory from a school district with annexation to a special charter district, or for dissolution of a school district with annexation to a special charter district must be filed with the governing body of the special charter district, and a certified copy thereof must be sent to each other detaching, dissolving, or annexing school district and to the regional board of school trustees of the region in which the regional superintendent has supervision and control, as defined in Section 3-14.2 of this Code, of the detaching or dissolving district. A petition for such annexation or detachment of territory must be filed by the school board of the detaching or dissolving district, by a majority of the legal resident voters in the dissolving district, or by two-thirds of a combination of the legal resident voters and the owners of record of any real estate with no legal resident voters in any territory proposed to be detached. If any of the territory proposed to be detached contains real estate with no legal resident voters, petitioners shall deliver the petition by certified mail, return receipt requested, to all owners of record of any real estate with no legal resident voters. Proof of the delivery must be presented as evidence at any hearing required by Section 7-2.6 of this Code. Any owner of record of real estate with no legal resident voters in any territory proposed to be detached may either sign the petition in person and before the circulator as described in Section 7-1 of this Code or return the petition with his or her notarized signature to be included as a petitioner. No person may sign a petition in the capacity of both a legal resident voter and owner of record. If there are no legal resident voters within the territory proposed to be detached, then the petition must be signed by all of the owners of record of the real estate of the territory. Petitions must contain all of the elements set forth in subsection (a) of Section 7-1 of this Code.
     Where there is only one school building in an approved operating school district, the building and building site may not be included in any detachment proceeding.