This building often gets confused with the Univermag Department Store, which also had a round cornerfront but is totally different. This building more represents the house of the communal worker or house of the specialists, it is NOT on the red square opposing the main station.
https://chindits.files.wordpress.com/2011/06/stalingrad-central-area.jpg
https://enlisted.net/de/news/show/126-schaut-auf-stalingrad-de/#!/
It seems that what was left of it after the battle was demolished and not rebuild. ATB, Till