Trying to find definitive history on this place is a nightmare. From what I can tell:
Jancho Enrique Irausquin Boulevard 79:
1968-1980 Aruba Sheraton
1980-1981 Grand
1981-1982 Hart Sheraton Casino
1983-1999 Palm Casino
2000-? Aruba Grand Beach Resort/Casino (Centurian casino)
2007-? Riu Palace (Cool Casino)
Yet there is a post card dated 1984 showing Aruba Palm Beach in that same building:
http://www.themogh.org/cg_pix/aw/115924.jpg
Was located next door to the Casablanca Casino (Jancho Enrique Irausquin Boulevard 77), which has a pretty storied history as well.