In 1923 a brick addition, labelled "Macpherson's Hotel Magma" was constructed by John Davey at 130 Main Street.

[2] In 1917, an integrated Delco Light system was installed in the hotel, the first in Superior, consisting of a gas-powered electric generator and mulltiple batteries.

In the 1920s, a screened-in sleeping porch for men was added, used seasonally by miners in the boom town, and a phone booth was installed in the lobby.

Upon her death in 1962, the hotel passed to Frank and Erma Sarver, and then to Soho Chun and Daisy Wing, who ran from 1967 to 1980.

[1] When the building began to decline, the once elegant lobby was used by the local food bank as a storage and distribution center.

[3] Despite the terrible condition of the building's interior, which had been vandalized by transients, the Magma Hotel was purchased in 2010 by Chilean Miguel A. Sfeir's company Los Cedros Superior.

[4] The boutique "Historic Hotel Magma" which emerged from this process has 21 rooms – 6 in the original building and 15 in the brick addition, a restaurant which seats 40 people, a wrap-around veranda on the second floor – the old sleeping porch – and a tea room and bar with a tiny stage, 10 tables, and an ornate bar from the film John Wick Chapter 2.