Salvaged wood floors

I am demolishing two townhouses in manhattan, I know, I know. They both have floors. One is original dark wood, thin strip in a reasonably complex pattern, I am guessing they have been there 35 years + very townhousy if there is a such a thing. The other is wide plank pale wood. I will have no use for the floors in my new project. How would I go about selling the floors – To a contractor ? or by posting etc or any other bright ideas – thanx

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