No it isn't. The building was razed in 1917. All that's left is the foundation.

I read it as the tower itself being demolished in 1917, but the laboratory building, which surrounded the base of the tower, and the foundations of the actual tower, being still intact.

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Edit. Found a link to a report of the current state of the site: http://www.teslasciencecenter.org/2011/05/visit-to-wardencly...