Gustaf de Frumerie graduated in 1890 and received his education as an architect at the Royal Institute of Technology in Stockholm in 1895.

[2] Gustaf de Frumerie became known thanks to the building of some large office and industrial facilities for Stockholm's gas, electricity and waterworks, where the chief architect was Boberg, whom he later succeeded in this capacity.

In 1913, he was the architect of Lillsjöstationen [sv] in Ulvsunda, whose facades he designed in a brick architecture with national romantic elements.

[4] He was the architect of the Untraverket [sv] at Dalälven in northern Uppland, which was inaugurated in 1918 and was the first hydropower plant to supply electricity to Stockholm.

[5] Norrmalmstorg's golden Art Nouveau-inspired luminaires on high poles were erected in 1911 and taken down in connection with a rebuilding in 1967 for right-hand traffic.