In 1931 in collaboration with Vlado Antolić, Löwy starts a tender for the city Savings Bank project in Sarajevo.

That same year he performed his first self-derived house in Petrić Street 7, at the space of the former Zagreb Trust block.

[3] From 1934 until 1941 Löwy implemented a number of major housing and business establishments in Zagreb, which belong to the very top of Croatian modernism.

In 1946 Löwy was forcibly moved by communists regime to the Bureau of Architecture project (APZ), where he worked on the types of "rational residential buildings.

[4] Surviving members of his family claim that Löwy has changed, in that period, as many as 17 locations in Zagreb as he hide from Nazis and NDH regime.

Under communists regime of newly founded SFR Yugoslavia he had a problems for being a Jew, but his acquaintance with sculptor Augustinčić partially helped him through those times.