perspective distortion. No matter how one rotates it doesn't feel correct because the verticals on these buildings aren't quite parallel. Also the sidewalk slopes upward from left to right. Decreasing the slant on the structures means increasing the slant on the sidewalk. So unless an editor is very careful about which cues to follow, something is going to come out wrong.
It helps to know that this is the Brooklyn Daily Eagle storefront, photographed in 1916. Most of Brooklyn development occurred between the American Civil War and World War I. This was relatively new construction when it was photographed so we can discount the possibility that significant shifting or settling would have altered the buildings themselves. Let's look for trustworthy points of reference within the image.
Here's a glance of the whole image after rotation, cropping, and several lengthy rounds of dirt and scratch removal.
keystone effect is subtle, but it's there. The solution is to perform a mild perspective crop.