Before I address those, I want to point out something that caught my eye in your post.

I just wanted to know, would there be an issue if you wanted to use a 1031 exchange if all of your properties were in a holding LLC?

This pain is going to be either in you labor, legal fights, tenant issues, but most likely a combination of all of them.

Usually projecting issues they were not prepared for yet.

the issue right now is that with both prices and rates high, it is very, very tough to have cash flow unless you're employing some kind of creative and/or hands-on and/or value-add strategy, or combination of strategies. 

The issue is that a train track runs behind it and the vibration is horrible (literally feels like an earthquake day and night).

I think this is a more common objection among higher income applicants who are more vulnerable to and aware of data sensitivity issues.

That way you will NEVER have an issue no matter what the market does!

I personally view it as a liability protection issue and base the decision on my costs to have the LLC versus the equity contained within.

I talked to 6 people this week who went out of state for more cash flow and are dealing with negative cash flow now (properties looked good on paper but maintenance, repairs, capex, tenant and PM issues have caused significant losses for them in reality).