This is a change request idea, sorry if it's a duplicate, I'm new to the forum. Using "Altar Garden" as an example, I have an "Altar of Aphrodite" max level building but would like to change it to an "Altar of Artemis". This was a mistake that I made a long time ago and it's way past the window that support provide for corrections. I understand and accept that. My change request suggestion is to make it possible to use a further "upgrade kit" (Altar Garden) to be applied to change the already made selection as described in the example above. Adding a selection kit would in normal circumstances bring the building up to your current age where appropriate. In this example however perhaps the building should stay at the same age to avoid abuse of changing it once then changing it back. Thus 1-up and reno kits would still be required.