I'm testing a script modification that should prevent some buildings from '800 and early '900 to be demolished.
I find ugly that, from 1925, the entire cities start to renew, while in the reality (at least in Europe), the original centre of a city keeps the ancient buildings.
I edited some files in res/config/buildings/bud, except the smaller buildings, the parks and all the industries... let's see what happens!
For now, it doesn't seem to work if you start a new game in 1900 or 1950, so I have to reach the 1925-1930 from 1850 to evaluate the effects of this mod.