I think generally I’d be interested in using the brrrr method so finding properties where I can be all in with rehab at 100-125k and then hopefully with an arv of 150-180.

I know the basics regarding framing, plumbing/electrical rough ins, hvac and roofing and all the associated permits that go with those as I've done all of that before but they've mostly been single family/condos with this being my first multifamily rehab.

I really like your advice though, I might actually adopt that method going forward. 

The electricity, plumbing, and/or heating in these places were invariably rigged by a drunk Mickey Mouse, whatever additions were built are of incredibly shoddy workmanship, and the last municipal inspector in there was obviously bribed to look the other way.

Is there good way to approach this or is there alternatives to this method?

With that method, you would have a duplex that you can rent both sides out cash flow and you put little money down and you would be living basically rent-free in the new duplex that in a year will be able to cash flow.

Our third option is to keep our current residence (which we have a great interest rate on) and invest in a property under 100k using either the BRRRR or turnkey method. 

Currently researching the best method for us to obtain our first property and which type of property that would be.  

My wife and I are reading and researching multiple different methods of investing.  

I have done both methods and its all about what you are looking for.