In my opinion, the entire system of re-issuing evolving buildings and their artifacts is totally crocked. I really hope that the designers will do something to fix it.
Old buildings are re-issued periodically for those who missed them first time round - but the artifact system is ridiculous - it is entirely chance if you will even get one, going all the way up to the top of the spire every time for six weeks; some people get lucky and gain several; others may have to wait several years to fully evolve their building.
It is a totally dysfunctional system.
Giving us a random building and a random artifact every six weeks is doing nothing to fix the mess. Rather we should be allowed to choose any building that we wish from the crafting list and buy it for Diamonds - and then we should be given 'Artifact Fragments' in all the side events and other places too like daily log-in bonuses, so that we could over a period of months collect enough of them to forge one Artifact for any building we choose. If 'Artifact Fragments' could be gained simply from logging in to one's city, as well as FA Waypoints, Tournaments, Spires and grand prizes in the questline events, that would motivate reluctant players to be far more involved in the game!
That would make far more sense - and the sooner they bring in a similar system, the better.
I do hope the developers are listening to this suggestion. Not the first time I have made it.