Also, how did he break down his proposal?

Its simply if others rent to professionals of a certain industry.They aren't, and your argument is so far out there the risk you propose falls into a file with the most frivolous of lawsuits, which one can never protect themselves against. 

In most jurisdictions, the development regulations make your proposal difficult but not impossible.

@Yangyang Jin The way this works is - you get a quote/proposal from a Contractor (he is licensed, right?).

While on the field construction activity will still be visible for many people for ongoing current projects and even few months down the line, on the other hand for new future possible projects a few weeks later after we received word that geotechnical proposals requests are down/low for future MFH developments, etc.

But before it hits the market I'd like to contact the seller and propose seller financing.

I proposed the idea of me buying the property subject-to and then her seller financing her equity to us.

Keep in mind, Pa just proposed and may have passed a $1 raise on cigarettes taxes.I also notice that gass is at least .20 cent higher in PA.

Propose a deal where you buy the house from them for $450,000.

I gave a survey proposal on one of them and there was a stack of nondisclosure docs so I never found out what the lease would pay or the length of time.