Some car companies don't allow transfers of their cars shortly after they are released.

To clarify, in every area I know of, listing agents are allowed to offer a commission, they just aren't allowed to use the MLS to communicate it.

They like to back out of deals when we have multiple people going in and out and legally allowed to deny us a walkthrough. 

Quote from @Robert Medina: Hello I have attempted to brrrr a property recently but didn’t quite go as well as I wanted.

And it can work really well for you as long as you pay attention to the statute requirements.In order to defer all tax you are selling investment real estate and buying investment real estate of at least the same value you sold. 

It has rented well over the years.

My plan is to funnel the rental incomes from all three properties, along with my W2 income, back into the HELOC while covering all expenses from it as well.

This will get you 90% of the way there and should be sufficient.It works the same in a saturated area, it's just more to sort through.You are aware that STRs in Denver are allowed only in certain zones and you must live onsite?

I am currently going to community college as well as in the process of getting my real estate license.

Those properties that are obviously vacant - as well as those you advertise for 'immediate occupancy' are well-known targets of squatters.