With one exception, all of the above accept reservations and making them is recommended. (And for desirable times at Oriole and RPM Steak, you'll need to make them WAY in advance.)
The exception is Purple Pig, and while the food is terrific, I would include a couple of caveats with any mention. First, at most times that they're open, the wait can be anywhere from 75 to 150 minutes. Second, this spring they are moving down the street, and presumably may be closed for a little while during the move (and also the new address at 444 N Michigan should be mentioned).
The comment about most of the nice places being steakhouses applies primarily to River North, not to the Loop itself or the West Loop. It's not clear whether adjacent neighborhoods are okay for the OP, but I've had some wonderful meals in the West Loop recently, at Bellemore, City Mouse, Smyth, and La Sardine.
EDITED TO ADD: I was going to mention Everest, the only true fine dining restaurant in the Loop itself and still outstanding, then realized you're looking for places near the St. Jane (formerly the Hard Rock), which is in the northeast corner of the Loop, almost a mile away. Given the distance (one block from the St Jane), I think the previously-mentioned Travelle is a fine choice, although I haven't been there since chef Tim Graham left to open Twain.
Last edited by
nsxtasy on March 20th, 2019, 9:02 am, edited 1 time in total.