Stranahan House, Trading Post and Campsite Historic Preservation Act - Directs the Secretary of the Interior to conduct a special resource study of the Stranahan House, trading post and camp historical and archeological site in Broward County, Florida, including both the property on which Stranahan House is located at 335 S.E. 6th Avenue in Fort Lauderdale, Florida 33301, as well as the adjacent property, at 500 East Las Olas Boulevard, where parts of the trading post and the campsite were located.