Decor:
(these are my gem prices, I know they doubled for many people, sorry)
Elevator Room 10 gems
Flowerbed Hallway 20,000 coins
Hotel Stairs 300 coins
this
or
Glass Walkway 10 gems
Tropical Garden Pool 2 gems
(boring)
Bamboo Hallway 13 gems
Fancy Nursery 499 gems
Skybridge locked by goal cost 0