Party hall

As the name suggests, these are large 2-story rooms which host parties. They cost $100k to build, generate $20k per day, and add 50 people to your population. Although the room's description may indicate problems with transportation being far away, revenue and population aren't affected by placement. You only need to provide transportation for the lower floor.

Information window
Parties occur between 1 & 5 PM, which will say 'A party is happening' so long as the room is occupied by at least one guest.

Strategy
Because these rooms pay for themselves quickly and aren't hindered by placement, it's advisable to build all 16 halls immediately after reaching 3 stars. Favorable locations would be spanning the entirety of floors 7&8 or B5&B6, and connecting them with escalators. They will have paid for themselves within two quarters and 16 of these will provide a constant $320k each day, so long as they're connected to transportation.