A multi-level fall protection system for a structure under construction, the structure having reinforced concrete decks including a first deck and a second deck arranged above the first deck and openings provided in the decks. The system includes bearing plates arranged in an associated opening in the first deck and having a flange portion larger than the associated opening. Lateral support blocks are arranged in an associated opening in the second deck. Vertical support posts are detachably secured at a bottom portion to an associated bearing plate and extend upwardly through an associated opening in the second deck. The vertical support posts are supported laterally by the lateral support blocks. At least one flexible support line extends between and is coupled to a pair of the vertical support posts.