Gammel Kongevej 25, situated opposite St. Jørgen's Lake, on the border between Vesterbro and Frederiksberg in Copenhagen, Denmark, consists of a five-storey Late Neoclassical residential building fronting the street and the former Emil Messerschmidt's Tannery on its rear.

The three-winged tannery complex is one of relatively few surviving examples of the many minor industrial enterprises that once dominated the courtyards of Copenhagen's Vesterbro and Nørrebro districts.

The large quantities of water that played an essential role in the production process was sourced directly from Rosenåen, a former moat from the 1620s, which crossed Gammel Kongevej at the site.

A commemorative plaque on the facade reads: "INGOLF·LARSEN-LEDET / GAVE HIS LIFE FOR / dENMARK'S fREEDOM / 29 jUNE 1944" ("INGOLF·LARSEN-LEDET / GAV HER SIT LIV FOR / DANMARK'S FRIHED / 29 JUNI 1944").

During the Occupation of Denmark in World War II, Ingolf Larsen-Ledet (1919-1944) was involved in the underground publication De danske Studenter as well as the escape routes out of Copenhagen.