Height of Success mission
– Collect from Taki Tower or Shiny Chateau 10 times
– Collect from Alaskan Cruise Routes 6 times
– Collect 15 Plants from friends
Rewards: 15 Energy, 150 XP
Complete the Tower! mission
– Upgrade Taki Tower to Level 4
– Collect from New York Airlines 12 times
– Supply 40 Businesses
Reward: Keegan Tower (Residence)
Rise to the Top
– Collect from Keegan Tower 15 times
– Collect 20 Conference Tables from Businesses or Friends
– Increase Population by 2,500
Rewards: 8 Zoning Permits and 200,000 Coins
And these are the requirements for the Keegan Tower missions in CityVille.