It looks like the Bistro at the Maison de Ville is closed for good, according to CityBusiness (subscription required). The Bistro closed indefinitely in August, though at the time chef Greg Picolo (and the restaurant's website) said it was for vacation and would last until mid-September, at which point they would "assess reopening possibilities."
Per CityBusiness' reporting, the closure is due to a fight between the owners of the Bistro and the new owner of the hotel. The new hotel owner, a recent transplant from El Paso, reportedly bought it last year "with the intention of turning it into office space." He ripped out the Bistro's air conditioning, not liking where it was located in the shared alley. He was also apparently peeved he didn't get $1000 of free food per month.
The fights mean that, as it stands now, the Bistro at Maison de Ville is no more. No word yet on what chef Picolo's next move will be.