Hello BP, I know that my first home will be multi unit space with me being an owner Occupant.

She wanted to demo basement wall, dig out 500 sf of crawl space and put egress where concrete patio it. 

So I have a two-flat that I'm house-hacking and I'm replacing the floor in my unit to be able to rent out later.

Basically by that point everything has probably been painted, cabinets are in and flooring may even be done. 

The long term goal is to get into the multifamily space and have that be my primary gig, but I'm cautious about moving forward too quickly and losing  the house I'm in now. 

Since you will be remote start finding contacts now: painters, flooring, handyman, etc.

Are there any stairwell/fire codes for building a room/ above a garage in a SOG side by side condominium, if i were to put a stairwell inside of the living space, entering off of a landing above the garage where the opening of a bedroom or office would be?

I do have plenty of South facing roof space and I am thinking of installing solar hot water panels to preheat the water for DHW and the heating system. 

Flooring: Do it so you never have to fix them again. 

It is a large 5 bed, 2.75 bath with an large den, pool and spa and outdoor space for the kids.