Holiday Office Hours – 2017 Posted 2:49 pm by admin & filed under Uncategorized. Blackstone Management Holiday Office Hours Thanksgiving – Closed Nov. 23 and 24, Reopen at 8am Nov. 27 Christmas – Closed Dec. 25, Reopen at 8am Dec. 26 New Years – Closed Jan. 1, Reopen at 8am Jan. 2