It's some very posh student accommodation. https://apartostudent.com/locations/oxford/the-spireworks. I suspect the amenities are all private.

I think to solve this one we map the entrances individually, and put the address (postal delivery point) on whichever object make sense. I'll make the entrance on the corner of Chapel and Cowley the "main" entrance because it's now fundamentally an apartment block by volume, with a shop underneath. Address for the apartments as a whole goes on that node, assuming it's for all flats inside. If we have street number and street, that's enough for now: flat numbers can come later.

I think they have a bike store down Chapel Street, guessing from the photos. That probably has a separate entrance.

The Tesco supermarket (not convenience, apparently!) node can be the address bearer for the store, since I think it has multiple entrances. It certainly used to. Does the Tesco still have a back entrance=shop on Avenue Lane (for Union Street Car Park)?