I'm in Oregon which basically whips people for being landlords but 99% of your problems are solved by getting good tenants so screen, screen, screen. 

Welcome Alana, you will find a lot of helpful people on this platform.

I know many people who own real estate that are not citizens of the US.

Furnished finder has some stats on people looking for furnished spaces in Denver that may help. 

I tried FB ads, and got some inquiries but no bookings.It would be nice to have an AI program that would respond to people looking for a certain sized property in your location for certain dates.

Think about it, why do people do Airbnb........make more money, however they have higher vacancy rates, and more management required.  

Given that we are on BP and so many people know Brandon, I am very surprised that not many people are invested in ODC.

What the heck is the matter with people?

Different people expect a different combination of risk/reward.  

Three Months ago, low to mid 6's were available.Rates are going to continually fluctuate but if you have a way to earn 10+% on your capital, the TIME you are not using it is going to cost you way more than the extra .5% per year will.You are walking over dollars to save pennies if you are waiting for the perfect rate, half of the people who held out on getting mid 6's were waiting for high 5's.