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.  

Happy to help answer any questions about the flight path, but in general there aren’t many areas where that is a concern.

It was also difficult to assess the heating situation after repairs since tenant refused to provide key to access unit for repairs and/emergencies, citing “privacy and safety” concerns.

Your question is a very common question, and I can appreciate your concern here.

If I represent buyers, I like to include my name and contact information along with a sentence that if anything changes after the signing but before the sale, the tenant is obligated to notify me in writing or it waives any of those changes.Buyers might have other tenant concerns that are specific to a property.

One was taken over by some squatters causing problems for the neighbors and the police were contacted who contacted the lender.

It seems like anyone can post anything without accountability—very concerning.  

If that is the benchmark of an investors diligence, educating them on compliance is a lost cause.

Give them notice if their pets cause any infractions they will need to be removed in 24 hours.