It's an iron framed, stone clad building, so you might expect the shell of it to remain, but of course the whole thing about Mackintosh is all those fabulous painted timber interiors.
On the first floor there are nine tall, narrow windows with wide frames, stone sills and deep arches of rubbed brick.
All but one of the 165 original boxy frame and stone homes still stand (though many have been altered).
Thick strands of bull kelp, which can grow more than a foot a day, frame the stone walls of towering sea cliffs.
The boxwoods framing the stone walkway are now so big there is hardly room to pass through.
The house has exposed white pine timber framing, a stone fireplace and a great room with lake views.
I have never been to Segovia, but the new Web site took me on a haunting stroll to a street framed by stone walls called Martínez Campos.
In the 1920s and '30s Hammer, the manufacturing tycoon, helped supply Western currency to the Soviets, in exchange for their loot of aristocrats' Fabergé jewelry, Easter eggs, picture frames and stone animals.
Framed by stone entry halls at either end, it has a severe, stripped-down Classicism that also suggests why Bonatz was able to continue building well into the Nazi era.
The theme is Northwest: There's an indoor waterfall framed by stone and huge rough-hewn wood beams, a fireplace, cherry paneling and a high ceiling that creates an open feel.
Steven Reichl, a spokesman for the museum, said that the work would include restoring 650 black-cherry window frames and stone repairs using granite recently taken from one of the original quarries, in New York State.
