Property Features/Flags

[Halsey]

What can I exactly do with a property?
Most properties have no benefits, they only generate a steady cash flow per minute. Some properties however can give you something extra. "Like what", you ask? Try and find out! A few examples:

• Small amount of health every few seconds.
  
  
• Set the taxi price.
  
  
• Control the Airport tax.
  
  
• Earn money by letting other people play minigames.
  

This is in FAQ's, I have found the above properties exept the last one, can anyone mention that property here? I think we dont have that kind of property. Thank You.