The HGI Silom is in theory open for bookings from tonight, 27 December, but appears to be sold out.
(I have a reservation for February, made via Accor for the property under its old Novotel branding, and received an email notification today.)
Novotel Bangkok Silom Road, formerly Novotel Bangkok Fenix Silom: You can book rooms from January 1, 2024. Theoretically, it could be sold out until that date, but it looks more likely that it is closed for a quick conversion. Normally, for wiki purposes, I keep the first available date to the general public as the opening date, knowing that in general new hotels have a soft opening about several days earlier than that.
---
The new
Hilton Bangkok Grande Asoke is a reflag of Pullman Bangkok Grande Sukhumvit Asoke. The address and location on the Hilton website aren't entirely right, they should be about 200 meters Northwest: 30 Sukhumvit 21, Asok Montri Rd, Watthana, Bangkok 10110, Thailand. Availability has not been loaded yet.