I love the concept especially given the need in your market for storing things like snow machines, boats, rvs etc, but also for repair or general "fab shops".As long as you are seeing the demand in your specific market for these spaces, and perhaps its worth getting some leases signed up prior to breaking ground but thats a personal preference thing, I think the numbers look promising if the use case is there.

Just make sure you account for Denver’s higher property taxes, insurance costs, and the ever changing landlord regulations when running your numbers.Feel free to ask more questions about the area or strategies—I’ve helped clients with similar goals and have personally done house hacks and short-term rentals around Boulder and Denver.

Since you're new to real estate (according to the title), you really don't have anything to base it on other than your own personal experiences staying elsewhere.

I live out of state so no way to talk to a local person these days. 

Of course, always check recent reviews.. they tell you more than a flashy website.Size Matters: I’d avoid both extremes... massive firms managing thousands of units and one-person operations juggling too much.

came to me through my personal connections How did you finance this deal?

IMO, the person you want to look at is Jonathon Haveles with Land Riches Blueprint. 

I never had that come into effect on my single family home purchases since I never wanted to personally be on the hook for such a high mortgage, but I think it might come into play for an MFH. 

If you decide to move into one of the units, that could help with your personal expenses and ease some of the pressure, but ensure you account for all the fixed and variable costs in your projections.4.

So my questions are:Do I write an addendum to the lease with just one person?