Apparently a gaye/lesbean motorcycle club or bar in LA (TheChipBoard doesn't like homosexual terms):

http://www.oac.cdlib.org/findaid/ark:/13030/c8mg7sp2/entire_text/

That burned in 1973:

http://connection.ebscohost.com/c/articles/10256897/1170-club-burns-l-a

Doesn't look very "casino related".