You could look for properties that are already getting solid rents in one of the units. 

I'm especially interested in hearing about how you've made a PMS geared more toward STRs work with MTR billing and leasing.I do remote operations support for an MTR/LTR company in Denver and am assisting with our tech stack build out. 

As you start you will want to take into consideration that many owners and hosts use more than just AirBNb to host their properties.  

I have received their listings for some time both in Austin and Denver. 

My neighbor did STR on 2 properties in Long Beach, but only allowed 30+ day rentals so that he did not have to register with the city.

. -- Much of Denver metro has outlawed it.

The capital required for Denver, and limited cash flow makes it a tough market to get your next one.

I'm all over areas with at least 50k people (Loveland, CO), but also places with a 1M+ (El Paso) and Large Areas like The Greater Denver Area. 

I'm a North Carolinian at heart, although I now in Denver, CO. 

It sucks but that's what is required when you own property.