That is 666 West Adams, better known as Homer Laughlin's house. Dr. Keeley, something of a quack who made a fortune from his Gold Cure for alcoholism, completed the house in 1898. He died two years later--Laughlin then bought it seemingly to impress his old Ohio friend President McKinley on a visit to LA in 1901.
My history of the house is here:
https://adamsboulevardlosangeles.blo...-also-see.html
Keeley had clinics all over the country--this ad appeared in the LA Herald on August 11, 1895:
