Monee, this is a better comparison because you can actually see the buildings on the street. The AT&T Building has been expanded 5 additional floors, the Park Central motel has been remodeled, the Flatiron looks the same, and Houston Place had the porcelain panels removed with the facade restored. Also, I think the date on the 1960's post card is incorrect. I see the Convention Center and it's old marquee along with the Park Central Inn. Those buildings opened in 1968.
Sure enough. You caught me on the date... Without knowing the information you provided about facts of the buildings and their time-line, another check of the picture pointed to later model cars. I know my cars very well. (Much better than I know my buildings for sure) and I quickly spotted a 1963 Chevy and worse yet, a 1967 Chevy!
I just guessed at the 1960 based on the 1950's cars I see. I do think that back then, a greater percentage of cars may have been 10 years old.
And funny, I did not know the At&T building had 5 floors added to it. It makes me laugh when I think about taking the pic and thinking, "no, I'm still too close" based on the relationship between that building and the Flatiron Building. Never occurred to me that the buildings that I was fairly familiar with had changed that much. Don't remember ever hearing that before... and to think that it is one of the few buildings that would have looked better had they removed 5 floors. Or more.