When the respective territories of any city or town and any district are contiguous they may be included in the limits of the district in the same manner as provided for the organization of fire protection districts. Such territory shall not be included or added to the territory of the district without the consent of the board of directors, certified to the board of county commissioners. In case any such territory is added to the district the property therein shall immediately become subject to the lien for the payment of bonds theretofore authorized by the district in the same manner as property within the district at the time of authorization of such bonds.