Top 3 hardening tips for durable rentals

[Isaac Schlittenhart]

I am getting ready to build some duplexes in the near future and I want to do what I can to ensure they stay nice and are durable to cut down on required repairs. What are the top three things you would suggest to "harden" the rental property against damage? ie backer boards lining bathroom walls so towel rods don't pull loose.

Looking forward to compiling a list!