The stair block stair thing makes a grove if done rigth which can add some nice texture. So can slabs or microblocks. Anything to give some sort of visual break up between floors can help. Even mordern skyscrapers are rarely just a flat texutre all the way up.
I agree , I like my new design much better ...though, can't decide on solid windows or panes...leaning more towards the panes.
It's a start ...think I might make the center ones out of concrete for even more definition.