Only one PHSU may be placed on any one residential parcel at one time. The Building/Trades Official, and/or any other authorized official, is authorized to permit the placement of more than one PHSU under the terms of § 502-106, in the event that the circumstances giving rise to the hardship permit warrant the placement of additional PHSUs in order to accommodate the storage of interior furnishing, goods and materials from a residence substantially damaged by flood, fire, act of God or other natural disaster.