This is the value of having someone who has local experience.The company you said, if they are some "remote" company, I guess they could provide the things that you need and save money, but I would hesitate to feel confident if they do not have regional experience and that you would be left vulnerable if issues arise with the design later on. 

This amounts to lost opportunity because if you had purchased RE, at the closing it can start producing return. 5) ADUs detract from the existing structure whether this is privacy, a garage, or just yard space. 6) this is related to number 1, but there are many more buyers looking to purchase homes for their family than there are RE investors looking to purchase small unit count properties.

Your question of "does the product exist" is a yes, but the better question might be "will the property cash flow at a 1.0X or better at 15% might be the more appropriate question. 

We offer 100% financing on both purchase and rehab (loan size up to 75% ARV) but only in 10 states.So if the location and the numbers are right, you can be as low as 0% down.Yes, this kind of leverage does exist on the short-term purchase and rehab loan, and for reasonable terms. 

If existing tenants are 50% under market value, you will need to make sure current tenants are out. 

But it does exist. 

Quote from @Hazel Anderson: Hello, bigger pockets pros, We have a rental property in Columbus and we are looking for a contractor who can replace the existing basement window with a standard sized window.

You can either buy an existing property or flip a building and then rent it out.

I took out the existing planter boxes and made new ones, changing the layout, and poured some new gravel to make the walkway more weed resistant and add drainage.  

If you’re handy which it sounds like you are, and are able to source and negotiate good deals  (which by being a long time local with an existing social network makes that part easier) then these skills will help you save money on rehab costs and by buying right (critical).