Hello, I'm a mental health counselor in private practice, and my office rent is my biggest expense category across all personal and business expenses. 

To retire with approximately $100k in annual (net) revenue from rentals.

The challenge I think he will face going with several 6/3's over a MF is that renting by the room is management-intensive, hard to scale, some areas have occupancy limits, and the biggest challenge which contributes to the scalability is probably that there seems to be extremely limited inventory of 6+/3+'s or even 5/2's with basement apartments for under $500k anywhere in Denver metro (correct me if I'm wrong Craig!). 

@Jake Burgdorf Newbie here but I'd say the biggest things are educating yourself (Bigger Pockets, YouTube, Books, etc.), practicing analyzing deals (daily), start looking at building a team, and raising the funds for your future property.

Colorado is one of (if not THE) biggest cannabis market in the United States.

@Allen NamDon’t worry man we’re usually always our own biggest critic.

I'd suspect that Cozy's primary drivers of revenue are - minimal interest made during that hold time, people paying for faster transfers, the tenant insurance they offer, and the tenant screening services they offer.And then there is that eventually switch-flip that surely is going to happen when they hit a critical mass. 

My biggest regret to date is not taking advantage of an FHA on a multi unit as my first property.

I found something from 2013 that stated 21% of apartment revenue went to CAPEX but data is coming from institutional investors which I would argue pay less in CAPEX than the regular investor.

My biggest advice I'd tell myself when I was first starting is to "just go for it".