@Christian Romero A few points first.
Cash for keys in LA county is not as easy as other states. You have to follow HCIDLA's guidelines and the current cost is 23k+ per person (not tenant). Even if the tenant signs the CFK document and sets a time to move out, if they dont, you have no ability to enforce the contract. Its a tenant free for all state. Keep that in mind
Second, this is a house hack scenario but some of your intended plans are over developing without ROI. ADU, parking, common area - good idea, Garden and solar, not so much. Since tenants pay for utilities, no sense in adding solar cost when you wont see a return. I tried tenant gardens on my house hack and it cost me (tenants leaving water on, attracting wild animals, wasn't taken care of, list goes on)
Lastly, what is your plan for funding? This is a huge endeavor (if you can get it under contract and tenants out) to do in LA. If you do not own any real estate, Look into the NACA loan program. I used it to buy my triplex + ADU.