One of the first renovation projects to commence was the reconstruction of the park 's seawall and promenade at a cost of $ 5.5 million . Although Battery Park was used as an emergency staging site following the September 11 attacks in 2001 , construction on the upper promenade continued largely uninterrupted , and it opened in December 2001 . The Battery Bosque , a new landscaped garden , opened in 2005
September 11 attacks
September 11 attacks
The Battery (Manhattan)