Thanks to @Red River Smoke @m-fine for your quick answers! I think my clearance will be around 26-27", so if I can remove that side bracket completely, I'm golden! (The main culprit is this balcony faucet I have sticking out about 4": didn't think about it when I was renovating the place a decade ago, and is a thorn in my BBQ space ...) I'm going to visit Costco again today, now that I've done more detailed measurements of my balcony space, and just make sure it's all kosher before I drop money on it!
Fair point to @ShowMeSmoke about the weight on the balcony: we've got SR steel re-bar through concrete in this building (rather than the wimpy wooden structures I had in my California balcony before), so we should be fine. (Neighbours routinely close up their balconies and then put their washer/dryer units there.)