Museum of the City of New York (MCNY).
We had been told by old-timers that there was a drug store with a soda fountain at that corner and this photo confirms that it was called Parker Drugs Luncheonette. This is where Clark's Restaurant is today.
The nice thing about the MCNY photo is that you can zoom in on the details and see what was selling in the drug store (Life Magazine, biologicals), along with the coming-soon Rand gift shop around the corner on Clark (blanket, 47 cents!) and -- guess what? - Towne Liquor Store! across the street from where it now stands.
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