What improvements do you make to your rental properties.

[Adam Anderson]

This has been asked before, but I want to ask the question with a bit of a spin. 

1-What is your favorite improvement you like to make to your properties to increase rent you can collect? (Made up example: I like to install a cupid fountain in the back yard because tenants will pay $50 more a month for cupid statues)

2- What is your favorite improvement you like to make to your properties to increase the durability of your property. (Made up example: I like to put diamond plate on the walls because that stuff in indestructible.)