Does anyone know how  difficult the building department is with owner builder permits?

I haven't met one that can show me a property that is worthwhile for me to look at as I work as hard as they do finding properties and my standards of location/value are way too difficult for them (I only buy in prime A locations and they don't have anything in those areas).   

That one is always the most difficult. 

There are some stringent but not difficult rules to follow. 

What I discovered is something I have never seen anyone speak about on Bigger Pockets (I am sure someone has discussed this I just have not seen this idea discussed at all...or anywhere in my short research period on cash flow and real estate properties.We hear everyone speak about Cash Flow, NOI, Cap Rate or Cash on Cash returns.. however I think there is another important benchmark for investors to consider when deciding their down payment percentage and financing levels because of their effects on cash flow...Capital Cost per $1 of Cash FlowOne of the most illuminating aspects of real estate investing is financing isn’t bad...Having spent all of my life not accumulating debt this has been a difficult psychological barrier to break through.

It's difficult enough to find a Single Family for $100k; it's going to be a challenge to find a decent multi-family, in New Jersey, in that price range.

It might require using some of your savings/downpayment money to accomplish this but you will find it extremely difficult to impossible to get a loan with that percentage.  

Everything, everywhere.Also, it's incredibly difficult for an inspector to approve work that he can't see - be prepared to tear down drywall to expose wiring (and is the insulation fire code approved?)

that's very true the time constraint on 1031's can be difficult that's why it's important sellers get assistance from experienced agents to facilitate the process.

It is very difficult to get an entire kitchen there that will fit your needs and that will be an upgrade for what you're ripping out!