[old_tv_nut]

Glenview Plant 25 was Zenith corp. HQ and R&D center from 1975-2000. During that time it was sold to Blackstone Realty and leased back. When Zenith vacated, it was leased to AON insurance.
Further details I haven't completely verified: Later it was sold to another owner. AON vacated in 2015, but still had to pay on the lease until 2017, at which point the owner could no longer repay their debt, not having found a renter for the large floor area.

I haven't found a story on the demolition, but it's not likely anyone would pay to demolish it if they didn't have plans to replace it with a more easily rentable development.