
I'm pretty sure the structure above is an old icehouse, possibly used to store produce or dairy products for a neighborhood delivery route. The door, more than a giant's step above the ground, is obviously meant to provide an opening for
stuff, as opposed to people entry. The handle is heavy-duty, to make sure that the thick, insulated door stays good and tight.

Just last week, I was walking down this, one of my favorite alleys, and look at who I found. Sitting up on that heavy-duty handle, daring any passerby to try opening it.

That's one ferocious warrior cat-woman ... lion lady ... leopard lass. I think she may belong to a local blogger; I'm about to check it out. Hope I have better luck than I did in asking The Google about icehouses. No, I didn't want to find out about Australian rock groups or Texas beer parlors.
Here's what Wikipedia had to offer by way of information; it's a long and honorable history, by the way.