Typically an ADU is inferior in size to the main improvements.

My two cents on the traffic comments - Unfortunately the problems extend to the far northwest suburbs as well (although they have improved since the I-90 expansion has been completed).  

But certainly far less than the full cost of the property and improvements.

yes, if the cash on cash return was high enough as is, and if the NOI can be improved.

If you think your dad will be the only person to give you grief about this you're wrong, but he's great practice to learn that you have to do it without some people, and in opposition of some people.

Scott Edwards I would guess it’s because it’s hard to plug-and-play an “improvements” value into it.

Unlimited Wealth: The Theory and Practice of Economic Alchemy - by Paul Zane Pilzer7.

Moving forward gold was used because it had zero practical uses - a gold sword or gold plow would be horrible compared to almost any other metal out there.

I once re-rented a SFR practically in a day after we cleaned and repainted the place, and was told by people coming by that no one bothers with it anymore, at least in my neck of the woods.

A to Z Home Improvement.