The casino appears to have been under construction prior to the events of Grand Theft Auto V. An “Opening Soon” banner is present outside the main entrance.
On June 6, 2019, the “Opening Soon” banner was removed from the main entrance. Construction barriers, a crate of wooden boards and a waste skip were also added just outside the doors. The automated barrier outside the garage door was also removed.
On June 13, 2019, more construction props were added near the front entrance of the casino. Later in the day, the official Rockstar Games Twitter Account announced an upcoming casino-themed content update coming soon in the heart of Vinewood.
On June 20, 2019, even more construction props were added near the front entrance of the casino. Shortly after, the official Rockstar Games Twitter Account and Rockstar Newswire gave more info about the upcoming update, including revealing a new name for an upcoming casino: The Diamond Casino & Resort.