I'm still hunting through the building list to find and root out the "orphan" buildings that don't have any connection to any other building in the game. There's still plenty of these. One of them is the Paradise Garden. Now that Parks are no longer optional, I was thinking of making this the final building in the Park line. (I know Park Arcology also exists, but because it's a civic building, I would prefer to go with the non-civic building.)
Paradise Garden shares very little already with the Parks, so I am going to add most of City Park's abilities to Paradise Garden: +3 culture, +3 health, +1 Artist slot, and +2 GPP for Great Artists. City Park's +1 happiness gets subsumed under Paradise Garden's +2. The Transhuman Era has lots of happiness already; losing 1 point won't hurt.
Also, Paradise Garden is more expensive than just about any other building in the game (Matter Decompiler is 2000, but it's not that spectacular either), and I think it's overcharging a lot for the 2 free Specialists. I think lowering the base cost from 1950 to 1200 is not out of line.