Once a facility gets taken out by a union - there will be a reluctance for anyone to come in and buy the facility.
I have been involved with this exact situation -
In a nut shell - we were looking for a facility to produce a new product - we were short on time and wanted to buy VS build.
We found a place that was perfect - would save us millions of dollars VS building -
Problem was the facility had a history of a crazy union willing to strike - willing to drive the company out of business to get their demands met.
We passed and as far as I know the facility never was put back into use.
Union taking a company out is sort of like an environmental disaster - it leaves a lasting stain.