By adding a shower and moving the sink in the first-floor bathroom, I created a more functional space.

Welcome to BP - and Greetings from the Lehigh Valley.

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?

Greetings all!

Bath tub/shower area sealed up.

Greetings BP Community!

Bathroom includes a ceramic tile floor, shower and single vanity.

My question pertains to the flooring and shower pan.

Right, the list of things to maintain and/or replace is never ending; rugs, AC filters, light bulbs, water filter in fridge, detector batteries, pest control, coffee maker, stove eyes and pans, silverware, bowls, glasses, sofa cushions, pillows, blinds, brooms, mops, vacuum, brushes, shower curtains, bath mats, beach towels. 

The moment you step inside, you're greeted by these massive windows that practically invite the outside in.