I've walked by this site quite a few times now, and I am curious as to how they are ultimately going to treat this abutting wall. The adjacent building appears to have active/in-use windows (certainly not a party wall), yet the gap is awful tight. I am curious if they are going to leave a gap to provide a "light corridor" for those windows, with a view of cladding 2 ft. away...or whether they are going to seal the gap and decommission the windows. Another interesting note is that the older building on the left appears significantly out-of-plumb (I base this from my standing next to it, not from these photos; I don't think it's just an optical illusion), and I know we sometimes design the gap seam/seal to hide the out-of-plumbness, but if it's an open gap, not sure how that's going to work...
Any insider knowledge, tips, tricks, or guesses about this?