@Kevin Sobilo, Thank you, this is great information and precisely what I was looking for.

Keep in mind that these policies are drafted by sophisticated attorneys and drafters and typically have precise language and exclusions. 

This is more precisely what I was trying to get at with my original question.

It's actionable and precise.

Dividing by percentage of square feet, or number of people, or any other metric that doesn't precisely corelate directly to the percentage of the utilities used may appear unfair and a legal opinion may agree.  

I'm just starting out and I'm trying to be laser precise on the leads that I spend my time with...would I be wasting my time and better served by moving on? 

I've learned when it comes to foundations, it's rather important for everything to go PRECISELY where it is supposed to.  

You really need to define what you want precisely and design your ad campaign around it.

Hello all, I am currently looking to buy a 2 or 3 flat (duplex/triplex for some of you)Ill try to give the most precise details I can and if someone could give me a ballpark figure I would greatly appreciate it.3 units2 - 2 bed 1 bath1- 1 Bed 1 bathI would need basically a complete gut and rehab which includes...Old shingles tear off install newNew drywallNew kitchens/bathNew fixturesNew plumbing through outNew flooringNew HVAC (None pre-existing) New electric through out - (minus panels)-Essentially brand new everything.Again, ballpark figures

More precisely, can we use the primary residence tax exemption for it even though we used it partially as an Air BNB?