Trying to upgrade Premium Residential Zones to Luxury

Yeah just pop bubbles, I just got 1 item from just popping bubbles you gotta be lucky though.

In order to unlock the modern looking luxury skyscrapers, you need to have a sufficient amount of specialty services available for your sims. This includes (in addition to parks) schools, transportation, casinos, landmarks, etc.

You can determine which areas are candidates for the modern skyscrapers by clicking on the "Wealth Forecast" (looks like a hard hat icon) under the residential tab. The dark orange buildings will upgrade to Luxurious Homes.

If your current buildings haven't finished upgrading, by adding enough services to the area, they will become luxury buildings by the next upgrade. Otherwise, you have to demolish the old buildings and start over to get the luxury buildings.