As for local meetups, here are a couple you should check out: COIN, Elevate, and the Columbus multi-family investor meet-up. 

Would coin-op machines in a triplex be worth the cost/trouble?

Same thing can be said about coin laundry facilities.If you're wealthy enough - I suppose anything can be pretty passive.

3. it sounds like you are going to move a coin op washer dryer to a common area.

I am looking to put 1 coin washer as all the tall building around except 2 and 3 family have them.

My partners and I are managing our units ourselves so we're thinking optimizations like this will be important to avoid emptying the coin trays every few weeks.

With no hiding spaces.Code type locks so only renters can get in.etc..Also coin free payment system will remove the temptation for local junkies to try to pry open the coin boxes.And a monitored camera system may cut down on locals trying to use it for a Marijuana smoking den.https://stealthmonitoring.com/security-blog/tips-for-securing-your-multifamily-residential-laundry-roomAlso know that washing machines cannot be in below freezing temps, so you will need some sort of climate control as it snows in Los Angeles.https://www.youtube.com/watch?

It is invested highly in the index, stocks, crypto 😆 ....the list goes on.

There is a mass of FAKE coins out there, high quality fakes.

Two sides to every coin.