Updated 7/2/2012 at 8:30 p.m.

CHICAGO (CBS)–A 16-year-old boy who snuck into the old Ravenswood Hospital building on the North Side and fell two stories through a hole in the floor died Monday.

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The Cook County Medical Examiner’s office identified the boy as Jose Morales, of the 6100 block of West Eddy Avenue.

Police say the teen and two 17-year-old boys walked into a former hospital building at 1931 W. Wilson Ave. through a fire escape.

While walking around inside, the youngest teen fell from either the second or third floor about 3:30 a.m., police said.

The boy was taken to Advocate Illinois Masonic Medical Center, where he was initially reported in critical condition with serious internal injuries.

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Police were questioning the two 17-year-old boys later Monday morning.

The Ravenswood Hospital closed in 2002. In the years afterward, the Neurologic and Orthopedic Hospital of Chicago took over one building, and another became a professional office building, and a third was converted into apartments.

But two buildings – the old hospital building, which dates from the turn of the last century, and the 1969 Adler Pavilion — have remained vacant. Le Lycée Français de Chicago, a private school, plans to demolish the old buildings and construct a new school on the site.

Neighbors have been complaining about trespassing and vandalism in the vacant buildings for some time. In a March EveryBlock post, a neighbor reported increased “activity” around the vacant old hospital building, as well as “a lot of new graffiti on the building and in the windows along Wilson” and several floors lit up in the middle of the night.

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Contributing: Sun-Times Media Wire