In the event that the State Highway Commissioner of the State of New Jersey is unable, by agreement with the owner or owners thereof, to cause title to all lands in Sussex County necessary or convenient for the construction, operation or maintenance of such service and facilities and approaches thereto to be conveyed to the State of Delaware, the Department of Transportation of Delaware shall, upon the written request of the State Highway Commissioner of New Jersey and upon being satisfactorily assured, by the deposit of cash or otherwise, by such State Highway Commissioner that the State of New Jersey will provide the money necessary to pay the condemnation money or damages awarded and expenses of the proceeding, condemn for the use of and to become a part of the ferry facilities the real estate in Sussex County, Delaware, deemed by the State Highway Commissioner of New Jersey and the Department of Transportation of Delaware to be necessary or convenient for the construction, operation and maintenance of the ferry service and facilities and approaches thereto. Such condemnation shall be effected in the manner in which the Department of Transportation is now authorized by law to condemn land for highway purposes.