The August Mentzel Tenement is a habitation house located in Gdańska Street, Poland.

Now, the ground floor of the building still houses one of the oldest pharmacies of Bydgoszcz, "Pod Łabędziem" (Under the Swan).

Thus, August Mentzel named his pharmacy Pod Łabędziem ("Under the Swan"), as this bird is associated with deep symbolism and its sign is easy to remember.

Bruno became the sole owner of the building in October 1932, till the end of World War II.

The actual swan sign is an epoxy resin copy of the antique one, realized by a local artist, Bogusław Czerwiński.

Renovation works are underway in the former pharmacy rooms at 5 Gdańska Street to adapt the facility to the public and open in 2020.

[9] The house has a Vienna Secession decoration on the facade, which features stylized swan motifs.