There is no differential factor number, however, it will change if you are buying tenant occupied, if they are are going to be vacant at closing, if they are going to stay the full lease or you have to pay cash for keys.

It is possible to be successful in either - it depends on your skillset, your goals, your time and many other factors. 

@Rud SevCap rates in NNN deals are influenced by factors like tenant quality, lease terms, location, and lease structure.

Therefore it's quite normal for a design change to be an additional service fee. 

Several things to consider: 1) One of the main purposes of segmenting your assets into separate LLC's is so that your personal net worth or equity in other business ventures or properties isn't exposed, so unless you have a high net worth or a lot of equity in a property, it might not be worth bothering going the separate LLC route, especially when it restricts your financing of the property.  2) Most any commercial financing you get from a local bank for a small property is going to have recourse anyhow and require that you sign a personal guarantee, so you're still personally on the hook to the bank even in the case of a commercial loan.  3) If you're a newer investor and buying a deal that's tight on cash flow, or if you don't have a ton of cash sitting in the bank already, your greatest risk factor as an investor is your investment failing economically due to poor financing terms or not operating the investment properly, not because you get sued. 

This amount will be a direct cost of refinancing that you'll need to factor into your overall analysis.3.

When house-hacking with 5% down, returns on cash invested could be huge when you factor in the appreciation gains.

Not essential but I've used it for other things and it's really cool when you are building out a new process, design, or work flow with your team as well.  

Stores like Home Depot or Ace will have products specifically designed for removing difficult adhesives, but you can also DIY with household products.

(Noticed I didn't include architects in that list - from my experience most architects are great at building design but shouldn't try to do land planning.)If you have never done any development like this before than it would make sense to partner with someone who has (or flip it entirely) once you have a site plan of the property's potential.