The license doesn't cost more, the service and quality does.And a note on that cost, in my experience hiring contractors, only a small percentage of the cost savings was due to finding the right guy who is willing to work for less.

I would highly recommend sticking to the 30 year option or not doing it at all. 

I would highly recommend you create an LP agreement.

Are their listings detailed with good-quality photos?

Since Airbnb remits at the state level when I see high numbers (or low) of what I am remitting for other OTAs/direct I then drill down to make sure listings are optimized on all channels.

Focusing solely on numbers often leads to the purchase of low-quality properties.

I was going to buy a owner occupied duplex with 3.5% down then buy an investment property using 25% down but my DTI ratio would not qualify for both mortgages in the same year unless I used a dscr loan but then the interest rate would be very high, and it'd be hard to make a deal work using a dscr loan because of that.

Gradually scale by researching high-growth markets, partnering with experienced investors, and exploring financing options like SBA loans.

I see two high end homes for rent, 50k, 70k, 210k per month..

From a personal standpoint I target 70% LTV for any investment I have that way gives me ability to sell it if I need tooI'm Canadian so it a T4 up here and yes I'm I high earner who can handle vacancies if need be.