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?

no walls were torn down, no new kitchens or baths installed, 2 had no new floor coverings installed all 3 had recent new electrical service. 

One other note:  mice have poor eyesight, so they mainly stay close to a wall. 

I erected a brick barrier wall around the window well.

.- Bullish on long term appreciation as many high net worth individuals move to the area, surrounding areas seeing luxury development, and businesses (Wall Street South).- Majority mom and pop operators, easy to become a top listing with the right marketing and property!

A current tenant has damaged the rental property beyond the normal wear & tear. (3 by 6-foot hole in dry wall; Garage access door complete broken off with damage door frame, the main entrance door way frame is broken and need to be replace, damage to the rear entrance door frame as well).

They chained their new pledges to the wall and urinated on them.

Well you are going to have to measure each wall.

Landlord shall maintain, and/or repair/replace the plumbing, heating, cooling, electrical systems, and the exterior walls and roof of the Property.

After the collections I have a 640 credit score and it hasn't moved for a few months.I rented a property with a few friends for a year and after move out we were charged with over 6000 $ in B.S damages including 5k to repaint all the interior walls of the home due to a few minor marks.