How to improve back yard

[Tim Small]

Hi everyone,

First time owning a property/landlording... I am currently living in one unit that I house hacked, and have two other tenants on the property. I plan to move in the near future and find another multi family... Anyways, you can see how the yard is two teirred, I installed a fence between the two levels so everyone has a private space. Originally, I had hopes of adding an ADU in the backyard there, but the permitting process in LA has proven to make that impossible. The 1/1 already has a nice private patio on the front side, and it seems like all this extra space in the back is a bit of an overkill for a smaller unit. I'm just curious if anyone has ideas on the smartest value add opportunity here. Do I install a communal pool? A communal fire pit area? Just leave it as a massive backyard for the 1/1?

TLDR: What is the ultimate ROI addition that can be put in a backyard? And is it better to have it be a communal space for 3 tenants or make it private for just one?

THANK YOU VERY MUCH