Proper bookkeeping will help keep track of who has what dollar amount invested into the property in case of a buyout or a death.  

A properly screened Section 8 tenant.

Your main concern should be whether these bedrooms and bathrooms on the lower level are legal and have the proper egress require for fire code and livability.

As @Terry Ouimet said...when you start off a project (or anything in life) from a bad/illegal foundation, it will never be right2) Yes absolutely we need to bring back or start anew with a proper green card/work visa program so we can get all of the LEGAL help we need in this country.

Hello, we have a. apartment complex in LA County and want to install security cameras in the common areas.

So, communication and assignment issues, as well as not being able to explain the maintenance issues and the required work.3) Proper documentation and quality of work issues.

They will be installing grab bars everywhere.

I recommend that you engage with a real estate accountant to ensure you set everything up properly. 

i agree that a new purchase at 75% equity will typically not have significant cash flow and may even be negative when properly allocating for all expenses.Investing to max equity without reserves is risky and you indicate would result in stress.  

There is a safety and follow up piece to have the proper information.