By CBS Photojournalist Eric Blumer

A historic building at 1840 Grant Street sits dilapidated on the east side of Denver's skyline. The 104-year-old Spanish Renaissance-style old Cathedral High School has been overrun by vandals, unhoused drug addicts and "urban explorers." A push is now on to preserve it.

The nonprofit urban preservation organization Historic Denver is leading the charge.

"Leaving a building like this can be a pathway towards demolition by neglect, and it would be a travesty if it was to be allowed to be demolished through lack of upkeep," said John Deffenbaugh, Historic Denver's CEO.

Cathedral High School was built in 1921 by the Catholic Diocese.

A view from a drone shows the Cathedral High School building in Denver CBS

"There really is no other building in Denve

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