In Xanadu

Needs Khans of the Steppe. The Pleasure Dome comes from the Devise Pleasure Dome decision: you need at least a kingdom-rank title and a held barony that's its county capital, not leased out, with no existing special building slot. Start as any emperor-tier ruler on the Steppe and the rank requirement is already sorted - take the decision, pay, wait for the builders. A stately pleasure-dome, decreed on schedule. Slots into the same campaign as Shut Up, Nerge and Tribute Band.