It's not terribly difficult to pierce the corporate veil, if you don't operate in a very consistent professional and totally separated from your personal finances manner.

That can be a difficult thing to learn.

Just seems illogical to me that it's so difficult to find a loan for this situation.

It's difficult to redeploy capital in this marketIf this was my one rental and not my passion at all I'd sell it in season. 

In a narrow chimney a liner can be difficult.  

For example, 20 A class Properties with A class tenants are going to be 1000 times less difficult and time demanding than 20 C class Properties with C class tenants.

I live in the Pacific Northwest, I'm a bit priced out of the market, I'm attracted to buying a duplex or fourplex in some state in the Southwest or Southeast where I can better afford to buy, I would like to move there and live in one of the units, but it seems like an overwhelming project to decide where to buy it seems there are a lot of factors involved and it's difficult for me to come to a decision.

If your siding is overlapping, it will make this difficult, but you wouldn’t necessarily add a vapor barrier to the outside of your house with your climate.

Some recurring advice I've seen in the "Intro to REI" videos and in the forums is to be conservative when estimating expenses, and I'm finding that makes it difficult to make any property cash flow, especially if I'm living in one of the units.For example, this fourplex: https://www.zillow.com/homedet... is only 250k (which is so much lower than most other fourplexes I've seen that it seems like there might be some additional due diligence required).

Something to understand with 'development' is it is very regional, and therefor difficult to provide good meaningful advice that translates nationwide.