The procedures for placing buildings and improvements in excess status are set forth in AR 405-90 and AFR 87-4. In instances of land acquisition where buildings and improvements were acquired incident thereto, DEs are designated by the Chief of Engineers under AR 405-90 to make disposition of this property. Coordination with the installation commander concerned is required. When, under AFR 87-4, the responsible DE is called upon by the Air Force Command to furnish an estimate of the value of buildings and improvements for the purpose of determining the approval authority for excessing the property, no formal appraisal will be made. If, in his opinion, the total property exceeds a value of $50,000, he will furnish only a rough estimate of its value in round figures. If the property is, in his opinion, of a value of $50,000 or less, he will limit his statement to this fact and will not specify an estimated valuation.