Wikipedia says "The Maryland Hotel existed from the early 1900s and was demolished in 1934. (Note: On April 27, 1935, Mary Stubbs Warner sailed from NY to SanFran and listed her home as The Maryland Hotel in Pasadena, California. This demolition date should be verified.)"
Mary Warner's address is possible. Most of the hotel burned down in 1914, but not this part.
I couldn't find the name of the architect, although Myron Hunt designed the pergola. But that's long gone.
I jotted a note that this photo was taken in 1910, but now I can't find my note.
bulk of the hotel (and I do mean bulk) burned down in 1914. A few online sources state the location as Colorado Blvd., where this picture might have been taken. It's noted that the photo was taken at Colorado and Los Robles, which I at first thought was a mistake. The building in my photo, the only remaining vestige of the hotel, is on the northeast corner of Union and Euclid. That's more than a city block of building burned down.
The fire started
during "the usual Saturday night dance." No one was hurt, and most
everyone's luggage was saved. This April, 1914 New York Times article (click "view full article") says the "hotel probably will be rebuilt."
You can see the Maryland from City Hall, and there's a commemorative plate, although I don't know where you can get one. I guess there's a lot I don't know about the Maryland.
Update: See additional information from Sid Gally in the comments.