The Darby's architect was John C. Austin. The "old family residence" at 234 W. Adams, referred to below, was moved to 340 W. Adams, where it remained until at least 1950:

August 8, 1909
LA Herald @ Library of Congress --
http://chroniclingamerica.loc.gov/lc...arRange&page=5
This photo is undated, but I'd guess it was from around 1930, give or take a few years. The home we see part of to the left of The Darby, 226 W. Adams, is shown on the 1922 Sanborn Map as the "Hotel Darby Annex (Help's Quarters)":

USCDL --
http://digitallibrary.usc.edu/cdm/re...ll170/id/69215
The Darby is on the right in this photo looking east on Adams from just west of Grand on January 16, 1928:

USCDL --
http://digitallibrary.usc.edu/cdm/si...d/1178/rec/115
This undated photo probably shows the Darby's lobby:

USCDL --
http://digitallibrary.usc.edu/cdm/re...ll170/id/69214
The dining room, also undated:

USCDL --
http://digitallibrary.usc.edu/cdm/re...ll170/id/69218
If you want to see more, there are three undated photos of room interiors here:
http://digitallibrary.usc.edu/cdm/re...ll170/id/69216
http://digitallibrary.usc.edu/cdm/re...ll170/id/69217
http://digitallibrary.usc.edu/cdm/re...ll170/id/69219
At some point between 1943 and 1950, the name changed to the Grace Apartment Hotel. The front has lost some windows but gained some ornamental detail:

GSV Mar 2015
The east side of the building:

GSV Mar 2015