@Nikolai_Bukav,
Unfortunitally, from what I understand, I think Big Cities tends to make some peoples' computers crash. I just installed it to test it out and when I went to exit the city it created after I downloaded it, the game crashed, so I immeditially deleted the mod. I still didn't see too many mansions appear on the new map through. However I did see two large bandit bases appear on the map, something that I have never seen before. In every other procedually generated city I played, only one of those ever showed up on the map.

@Lord Duck
Do you mean how to get the building to spawn in the maps/worlds? Should be either as a lot available for purchase under the housing/residential bar should you wish to place in an already generated world; or if subscribed now and you want multiple to spawn new world, then it should generate as a normal building in the map just by being subscribed. For best chances of spawning, I strongly recommend subscribing to the Big Cities mod as well. Hope this helps.

If you’re talking about my building world, that particular world is a flat map on build mode with infinite money and credits.

how do you spawn maps?

Nikolai_Bukav,
Yeah, especially after I make my next mansion, which should be included in the next update for the Alpine City Lotpack

Just add trees surrounding the lots and we can "Beverly Hillsify" the place!

Nikolai_Bukav,
Great Job! I was waiting for someone else to make a mansion on a 2 by 3 lot. Speaking of which, I wonder how it would look next the first of my "Alpine Mansions"