Jakob Posament (1879 - 1926) was one of Lemberg's leading commercialists and a cultural activists. Posament was the founder and first secretary of the Self-Help Association of Galicia and Bukovyna (Stowarzyszenie Zapomogowe Galicji i Bukowiny) with headquarters in Lemberg (which was founded in 1897 by Filip Besen i Dawid Salamander). Posament was also member of Association of Accountants and Employees of Trade (Stowarzyszenie Buchalterów i Subiektów handlowych), Lemberg Association of Tradesmen (Lwowskie Stowarzyszenie Kupców), Central Association of Tradesmen and Industrialists (Centralne Stowarzyszenie Kupców i Przemysłowców), as well as a whole range of cultural, charitative and philantropic institutions and societies.
A three-storied
residential building constructed in 1906 under a project designed by architect Ivan Levynskyi (Jan Lewiński) for Henryk
Gottlieb Haszlakiewicz. This is a residential townhouse in the style of Secession (Art Nouveau) with some elements of the
Neo-Romanesque and Neo-Gothic styles, an architectural
monument (protection number M-7). Among the
residents of this house in the early 20th century, there
were Yevhen Olesnytskyi, a member of the Galician Sejm and of
the Imperial Council in Vienna, and Adam
Krechowiecki, the editor of Gazeta Lwówska; architects Adam Opolski and Ignacy Kędzerski had their office there. Today
the building is used for dwelling
purposes.