* Land was less scarce.
* Different amenities - doubt you saw many granite countertops or stainless steel appliances in the 1910s
* Sparse (or no) plumbing/electricity
* Fewer building codes/regulations
True, but this is also Denver. It depends on the location.
> Different amenities - doubt you saw many granite countertops or stainless steel appliances in the 1910s
Pretty sure your fancy 1910 house has been renovated more than a few times. Homes actually require maintenance and upgrades to be livable.
> Sparse (or no) plumbing/electricity
In 1910 I'm sure they had something. But see the previous point.
> Fewer building codes/regulations
Again, the home should have been upgraded unless the codes/regulations were superfluous; grandfather clauses only take one so far.
As an investment, a 3X appreciation over 100 years sans property taxes is still a quite crappy return, but at least you (and your progeny) get to live in it.