The factors are based by this:Geographical LocationStone (many different to choose from)Thickness (I believe where you are 2cm (3/4") is standard)Edge ProfileCutouts (all are additional)Sinks (who is providing)I would use the figure $45/SF to cover your tail.

I was able to find out his contact information pretty easily with a simple google search. 

If this potential buyer were unscrupulous, they could easily contact the seller afterward so why do they need to be watched closely during the walk-through?

The reality is the opposite - if it's not in writing then the PMC doesn't have to provide the service or can charge extra for it!

While the deal does not hinge on the ground-up phase, it could provide a significant upside.After consulting with the City Zoning Department and reviewing the dimensional regulations of the neighborhood district, it appears that my plan is feasible.

And I provide Rent to own homes for people with less -than perfect credit 

NACA was formed in 1988 and provides an affordable option for potential first-time buyers:✅ No down payment✅ No closing costs or fees✅ No mortgage insurance✅ No consideration of credit score✅ Below market fixed interest rateThere are several requirements to be eligible, starting with attending one of their workshops.https://www.naca.com

For Deposits, unless the program will also provide the Deposits (some do, some don't) they must have the appropriate funds.

If you purchased that last year, you are going to be negative more than the $2k/month you estimate when accounting for all expenditures using the numbers you provided.  

Intellirent does provide the full credit report.