The fact that you cannot find much information about their LLC is not a concern.  

We had Crestcore Management and they neglected the tenant so the tenant moved out because they weren't able to fix the heating concern in a timely manner.

Just be sure to clarify that she isn’t a leaseholder but is authorized to reside in the unit.If you’re concerned about liability or want more peace of mind, you could ask the primary applicant for additional security, such as a higher deposit, depending on what’s allowed under Colorado law. 

I just don't want to buy that close to the water due to flooding concerns.  

The other thing that concerns me is you mention that you are both high income earners but that you are “trying” to save an emergency fund.

Get a small inground fiberglass pool.No above ground pool unless you have a mobile home.

Need I be concerned with UBTI?

I understand if you want to sell 1 of the lots, but I'm not sure about your concern about paying off the debt so that you own it free and clear. 

So weather is as diverse as it is from Cleveland to Mobile.. 

I've been a real estate investor my entire life, doing my first deal as a senior in high school ($5,000 mobile home).