Seems like the simplest way to get what you need.

Probably the simplest to get started might just be a promissory coupled with a joint venture agreement.Here in Chicago that was the first way I took private money. 

Generally speaking just following up often and offering vendors they could use or other real estate information is the simplest way to get started.

The simplest option may be to just sell it, take your proceeds and start over with a nice cushion.

The simplest solution would be to provide an opening directly to the outside and install a bathroom exhaust fan greater than or equal to 30cfm somewhere(ideally at the far end of the space to provide mixing) in the space, that would operate during occupied hours or however the city defines it. 

I have never heard of that before, sounds interesting Many choices, but cheapest and simplest is ipostal1. 

Real estate is the simplest investment opportunity in the world and you really shouldn't use a mentor to teach you these stuffs.

That would be the easiest and simplest route if seller will agree to it.

Maybe just start simple and try to get a good deal on a new primary residence, maybe even one you can add value to, that you can rent out in the future.I agree with @Joe Garretson that house hacking is not a catch all solution as it is not a good fit for everyone, however, it is one of the simplest and most effective ways to get started. 

The loan to cost model can be calculated in a variety of ways, and the terms widely different, but I'll  share the most common options I have seen recently from other private lenders.The first LTC option is by far the simplest - and the one I see most frequently right now.