Its sad to see a French concept close its doors. But I always saw Byrdies as an awkward addition to Nulu. A French bistrot with some good beers and croque monsieur options could work there. But not hyper expensive entrees with no moderate options. Oh well.
It seems like The Exchange is built for a Nulu clientele. Nulu seems to be more mobile, grab a beer and some simple, unhealthy (mainly) food and move on to somewhere else before the outing ends. Serious sit down, expensive dining works better in a few other areas of town in my opinion.