Orange roofs?

[CrapozoC 0]

Hi,
I'm new to sim city 

I have seen in a screenshot that someones residential houses all had orange tile roofs.
Mine never does, only the brown/dark grey bluish ones.
Is the orange roofs a mod or something?
I tried searching the mods but came up with nothing

[Facelessman 5]

You may have noticed an architectural style tool in the game. By default, the styles rotate every 5 years. The orange roofs are the "European-Modern" style buildings. So if you want those, you can set your city to build only that style. Otherwise, they should grow during years 16-20, 36-40, 56-60, etc. Of course, they need a place to grow, so make sure you have some zones for them to grow on during those years.

[CrapozoC 0]

Ohhh

So after some number of years they change styles

Ok thanks very much for notifying me that didnt know!