Carnation served up ice cream on this spot from 1941 to 1988, when it became a Sizzler Steak House.  Since 2013 it's been Lips Restaurant, a "Supper club run by drag queens with nightly live acts, a cafe menu, gospel brunch and a kitschy decor".

The "original" Carnation, circa 1950.  I think it's the same tree.

The cash register says 15¢ and the clock says 1:30 PM so maybe the folks at the counter are enjoying an afternoon coffee break.  The ice cream choices, in the lower right hand corner, appear to be "Vanilla," "Peanut Brittle," "Fresh Strawberry," "Marshmellow," and "Chocolate".  Hey, wait a minute -- maybe a scoop of ice cream is 15¢.  What if coffee was 5¢?

My grandfather lived on Ohio Street, so when I would visit or stay with him we would walk up there to get ice cream.  Some times they would let me clean out the mostly empty tub of ice cream.  I lived in Lakeside back in the day, so visiting the city and having ice cream would be a treat — Stan Peterson ‘61

The tree in front of both the Carnation store photos answers your question.  It's growth pattern is too unique to be in different locations, and the parking area is also identical.  The remodeling is special, as they did a ton of work moving windows, doors and support columns — Earl Feldman '61