I don't really see how Lewis' post is apparently so terrible.
I mean- take them over and just give them to people? Really?
Why not? It's not like they're especially useful if they're just sitting there owned by some random riches.
But whose business is that but their own? They sit there looking pretty. That's useful enough to me.
I think the question is why you're particularly shocked and/or appalled at what Lewis said relative to normal leftist rhetoric on topics like this (unless that's something that always bothers you).
Mind you, I don't agree with Lewis's proposed expropriation in this case, mainly because I think that all of these houses have great historical value that ought to be preserved, also because I don't think tenements row on row in larger buildings are really particularly desirable living spaces all things considered (I can be sold on row-houses and flats above shops).