Get a few quotes. and if you do not do it, when you go to refinance into a long term loan the appraiser will likely mark the report as "subject to" a structural engineer report of the foundation. and you will not be able to refi until you have done the  work that is required. 

To me this certainly includes;  plumbing and electrical.   

Electrical fire hazards IMO- MOST IMPORTANT: It sounds like they are not happy.

.- Consider hiring professionals like architects, engineers, and construction managers to help with the process.This process can be lengthy and involves several steps, but with the right guidance and preparation, it can be successful.

So I’m in a bit of a bind, I have a duplex I’m house hacking we remodeled entire thing, new hvac, electric panels, electric main, updated plumbing, water heaters, furnace, install central air, roof.

I have redone the foundation, all new electric, all new plumbing (PVC to the street), all new kitchen, added a bath, new flooring, all new windows/doors, updated all insulated while walls were open for electrical, new furnace/AC, new siding.

A cost segregation study with an engineer and audit protection can easily cost less than $5k. 

I would probably choose to do the electrical plumbing first.

The house is about 70% complete but still needs electrical, plumbing, and AC brought up to code and the finish out to be completed.

Hello BP Community,My name is Patrick Belanger, and my wife and I (both engineers turned entrepreneurs) havebeen investing in Edmonton and the surrounding communities since 2013, buildinga 32 unit local portfolio of single family homes, duplexes, garage suites, andsmall new-build multifamily (6 and 8 unit properties).