The Hudson River Museum, located in Trevor Park, in Yonkers, NY consists of two separate structures, the Glenview Mansion built in 1877, and another structure built in or around 1967.

The West Wing addition, the fifth phase of the Master Plan, was coordinated with the Yonkers Amphitheater and constructed in 2012 on the south side of the Hudson River Museum. The West Wing adds a Changing Exhibitions Gallery to the Museum, a 100-seat tiered auditorium with associated climate-controlled art storage, exhibition preparation spaces, and new museum offices. The West Wing Addition also created a new special events entrance to the Museum facing the Hudson River and shares a public riverfront plaza with the Yonkers Amphitheater.