(d) Establishment and offer of just compensation. Before the initiation of negotiations, the Agency shall establish an amount which it believes is just compensation for the real property. The amount shall not be less than the approved appraisal of the fair market value of the property, taking into account the value of allowable damages or benefits to any remaining property. An Agency official must establish the amount believed to be just compensation. (See § 24.104.) Promptly thereafter, the Agency shall make a written offer to the owner to acquire the property for the full amount believed to be just compensation. (See appendix A, § 24.102(d).)