This investigation is critical to assess whether the investment is economically feasible and will generate the desired revenue.

They’ll show you what they earned last year so you can get a sense of what to expect, but be sure to look at revenue/ occupancy trends over time to see if the market is trending down post-2021 (and give their totals a haircut for your own forward looking projections if so).

Or do they calculate STR avg rates or revenue to qualify? 

I always think that's a great place to start when looking to invest out of state.I also agree with what most said - design, amenities and furnishings will drive revenue.

What are the things we should be looking at to facilitate efficient and safe collection of the revenue and depositing it into the bank?  

For example, Pennsylvania Department of Revenue takes the position that transferring a property from your personal name to an LLC (vice versa) triggers realty transfer taxes. 

(g) Any federal Internal Revenue Service liens that, pursuant to provisions of federal law, are not discharged by the sale, even though the tax collector has provided proper notice to the Internal Revenue Service before that date.

To get the most out of your investment, make the most of the rental revenue from other flats and think about renting out extra beds or units to renters.

Typically, short term vacation rental management in our area of coastal Oregon can typically range from 20-35% of the gross revenue!?

Does buying a STR with a pool put you at an advantage and increase revenue because it's more desirable for STR tenants?