I'll try to present a basic plan with some napkin math soon.

@Yasmani DelgadoI think 50% rule is okay if you want a real quick back of the napkin.

We tore the toilet out, put a sanitary cover over the hole, took off a shower head, tore off the shower door, put both the toilet and shower head on the shower floor, placed an upside down box on top of both hiding them, randomly put the shower door in another room in the house, threw a bunch of other boxes and crap in there (it may have included boxed "first night in new home toiletries and celebratory whiskey"...), and I suggested that the agent use the term "storage closet" as he opened the door for the appraiser. 

So to answer your question, yes your calculations (for a rough "back of napkin" analysis) are close enough to give you the right conclusion.

Is pre-construction timeline and permit pulling part of that timeline or is that a napkin sketch to doorbell timeline?

My Contractor made the decent, safe and sanitary repairs.

If you are starting with a napkin sketch (custom house)  then yes. 

Owners not in the hotel program but use Airbnb and similar)The developer is segregating  cleaning from our shared costs, not offering a viable/sanitary alternative (i.e.

Below are the "back of the napkin" numbers I looked up and some I took a guess. 

First, the excuse it's not a "legal" document is a poor one - a napkin with rent amount and dates and signatures is a written lease!