I did a little rendering of the "Buncher Blight" core of Schweitzer Lock in Inkscape. Here it is...
In terms of color coding,
orange are three remaining houses along S Canal. The middle is condemned, IIRC, so soon there will be two.
Gold is one three-unit apartment which is still standing. It actually looks to be in good shape, and I hope it survives. Grey are other buildings - mostly warehouses, but also a
decaying hunk of a church, something with a ruined facade, the Worhola scrapyard, and Mullin's Diner. Everything besides the scrapyard building, diner, and maybe one of the warehouses should be preserved if possible.
I outlined in red everything Buncher owns. As you can see, it's most of this area - and until they sold the building BrianTH noted, they owned even more. Outlined in green are a few parcels owned directly by the URA. While Buncher does own two of the old warehouses (and the one by the river is in seemingly great shape) for the most part they're land banking empty lots, and the remaining buildings are concentrated on the properties they don't own.
Edit: I'm not 100% opposed to something like what Allegheny Riverfront Vision outlined. I do think it would be a shame if some of the buildings still standing were demolished - both the ones I already linked to and
this and
this building, as both have potential for reuse (is the first being used as an office now?) But there's a pretty unique chance here to build an entirely new mini-neighborhood from the ground up, if not fucked up. Thus I'd be willing to trade off the buildings if something dense and mixed use took their place.