If you turn any two "bonus rooms" (rec room, office, formal dining room) into two more bedrooms, then you're at $5,950+ per month—a 138% increase in rental income.Now, imagine scaling this across multiple properties while keeping lower upfront costs compared to multifamily properties.

With that being said, you can buy rental properties with most banks if you have a company utilizing their commercial loan options or going with a mortgage broker as well (that normally shops around & in multiple states to offer you the best financing option).

Multiple states seem like they would be very challenging.I am a fellow investor and general contractor here in Chicago.  

We have multiple doors and still find a lot of useful information.

I am hoping to build multiple income streams as we are both physicians and looking to grow our family, but there is very little flexibility in clinical schedules.

However, you've already mentioned four markets and multiple strategies -- a flip in TX, STR in GA, private lending in AL, and soon to be a licensed realtor in HI.

After receiving a seller multiple counter offer, I removed the inspection contingency on my second offer.

I have done a decent amount of "boots on the ground" scouting and have gathered pricing from multiple businesses through tours and am more intrigued than ever on this investing strategy.

Realtor found it for me, won it over multiples offers without adding more to the offer.

Many property management software tools also syndicate to multiple sites at once, which helps save time.