Built 2 lobbies. Put in a normal and service elevator up to 15th floor. Filled the space with hotel rooms and housekeepers.
After that there were no money worries at all.
Then I built more lobbies and filled the place with offices. That gained me population.
Repeat until you reach 5 stars. That was on hardcore level. The only real difficulty came from that fire problem.
Had no use for any commercial units at all. Apart from a burger joint.
The game design and interface are great, but this game is far too easy! Please please please sort this out on the next update.
