I have friends in CA who converted their two-car garage into an apartment and used it for additional income.

I have homeowner's/hazard insurance on the property through my mortgage, but I do not have any additional landlord insurance or other coverages.  

Addition costs for staging.  

I am a first time real estate investor looking the following property : https://www.redfin.com/OR/Forest-Grove/2418-Cedar-Cir-97116/...its a pretty large duplex in Forest Grove OR,  the trick is though, its on a lot zoned for a 4 plex so I am lookinginto house hacking, converting into a triplex, then living in one unit while renting out the remaining two unitsThe left garage has been converted to living space, with a living room, half bath, a laundry room with a sink and some counters/cupboards and a bedroom, it is a part of what was an existing 3bd unitIf I were to acquire the asset, I would first attempt to convert that space into its own unit The line items as I see (be in mind, I am totally new to this) would be to >put up dry wall where the door to the rest of the house is,>add a shower to the half bathroom >install a water heater in the adjacent 3bd unit> install a kitchen in the laundry room, (stove , oven , sink, counter space)>add a shower to the half bath Assuming I can convert it to a 3plex, I could at-least cash flow on my investment after I leave My plan would be to put minimum down payment of 3.5% (FHA loan) that way I can have a decent amount of capital free to do the renovationsThe only concern is when I crunch the numbers to get my ROI, I have no idea how much its going to cost to convert the additional living space to a third unitAny experienced investors here know how I can estimate this before I try to make an offer?

I agree in that the easiest way to go about this is to sit him down and in your best manner state that there are inconsistencies and you'd like additional documentation as you do have an obligation to uphold (in keeping the current tenants safe and ensuring this person is who they say they are).

The additional income from the ADUs will easily cover the cost of the loan and produce really solid cashflow.

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In general,LLC will provide basic asset and liability protection and allow you to get its own bank account, where you can receive money, pay expenses and distribute profits.

She's been receiving phone calls about one of her rental properties even thought it's been rented.