It is essentially two units, 1B/1Ba, 3B/2Ba.

If I moved to Las Vegas, I would be getting paid approximately $800 more because I would be paying no state tax (California is expensive), so I could essentially live rent-free relatively speaking (I see a ton of rentals for around this price online – sharing with a roommate).

Came away with $10,000 and essentially lived for free for 9 months.

However, at essentially $143,000 (after seller concessions), a new roof would still allow for an acceptable cash-on-cash return. 

Paying sub contractors, and ensuring their safety (GC is liable), are two of his many required duties per contract. 

A house hack is like that beginner run (but flipping or wholesaling is more like a double black diamond).With a house hack, you can make money while learning the essential skills you'll need to succeed in RE investing (e.g.; how to analyze properties, how to find an investor-friendly agent, how to engage in a strong due diligence process, how to screen tenants, how to manage the property, how to build a network of contractors, plumbers, electricians and other pros, how to manage the book keeping of the property, etc., etc., etc.

Essentially it means that it was a duplex prior to some restrictions put in place that would prevent it from being a duplex currently if built new. 

Safety part of the syndication concerns me.Which kind of professionals would advice on these sort of financing aspects?

Comps from other buildings would be based on income, so aren't they essentially irrelevant?

I am considering doing some diligence up front and essentially interviewing several different tradesmen and come to an agreement on an hourly rate, and have them be the "goto" people for my PM.