If you want to look at total expenses over the years, you need to look at total income received as well with your potential sale price. 

Granted once I rent out the unit I leave, after vacancy and everything we would cash flow almost 400(minus heloc as well)All the deals I find.

You didn't write how much 'sweat equity' you put into this place, but it was likely well worth it given the $400K cash out.  

I'd recommend looking at costs. your build cost is going to be well over other homes because of the fixed costs like slab, Hvac, roof, etc. check the market drivers and weight the benefits of short term versus long term. long term is no furniture and help pays mortgage but at this size it doesn't really cover everything. we didn't find a lot of economies of scale in single family detached. can you build more than one unit?

Commercial properties are not evaluated by "comps" (well not exactly) they are evaluated on cash flow.

With your considerable experience and, I'm assuming, strong credit score, you would be well-positioned to receive high leverage and low rates from most private lenders.

I certainly think that’s a great option as well.

Tile done, trim done, final painting happening as well. 

And make sure to plan for the additional depreciation as well!

Having realistic expectations was something I had to accept early on.Property managers are going to be key for your investing as well.