He usually buys in C neighborhoods and has to do heavy rehab, but he's a construction guy that also runs his own property management company, so it's 2nd nature for him.

Does anyone have any experience (or know someone or a company that might) be able to demo a concrete staircase Ana turn it into a driveway and ADU ramp ?

Wasn't for me.I'm not affiliated with the company, although their founder @Brandon Hall is a colleague and a friend of mine. 

Coldwell Banker Commercial Fisher Group, Fisher Management Company.

The concern with the DSCR loan is that I need to make the property present as though it's rented to individuals during appraisal (tough since it's a working rehab facility now) and must create another lease that shows the tenant as personal and not a company.

.: I just hired an architect to design and plans submit for ADU in my 8 multi unit to use the tuck under parking.Some people say do not try to be the general contractor as it will take way more time, costly mistakes and will be nearly impossible to manage with current work. best to hire a company that will do it all and cost about $250 per square foot.

Currently I own a large real estate company and still get some great value out being in his inner circle of real estate operators. 

Mine are long term rentals (in 2 states), 3 SFH and 1 mult-unit and they recommended a Wyoming Trust over a Holding Company over an LLC for each property.

Some of the manufactured home companies have a modular home option, I know Clayton does.

At the very least you'll always know where you stand in any given situation, something few investors are secure about.