where City Center now is, or where Harrahs now is?

LVA says the former. I suggest it was the latter. There were two Holiday Inns on the Strip. One was called "Center Strip", which became Harrahs. I've forgotten what the other's designation was, but it became Boardwalk.

I remember because I ended up in the wrong Holiday Inn on a trip to LV about 30-40 years ago. I got charged as a "no show" at one, and actually stayed at the other .