The declaration shall be sent at least four months before the date scheduled for the opening of the office, by registered letter with acknowledgement of receipt. It shall state:
1° The location of the professional domicile or registered office of the interested party and the location where he intends to open a branch office;
2° The arrangements made by the interested party to carry out his duties at his professional domicile or registered office and at the branch office, the operating conditions of the latter and the measures adopted to ensure any liaison with the principal office.