That a couple of other casinos also shared that address?

Though apparently Casa Vegas occupied the address at the same time as the other two? The 1945 phone book lists the Casa Vegas Club on the L.A. Hwy, but doesn't list a specific number for the address.

CASA VEGAS--3131 Hwy 91, L.A. Hwy--Las Vegas--1945-1950
DIAMOND HORSESHOE--3131 S. 5th St.--Las Vegas--1946-1947
STORK CLUB--3131 S. 5th St.--Las Vegas--1947-1950