The Fair Housing Act is what applies to privately owned property (with the exceptions Bruce listed above) and it forbids discrimination against prospective tenants because of their disability as well as race, religion, sex (including gender identity and sexual orientation), skin color, familial status, and national origin. 

You having no skin in the game would make them additionally wary.

About 9 acres land is available .How difficult is it to get it rezoned to commercial to set up a gas station?

Lots of different ways to skin it.Most of the time when we look to buy real estate we are trying to come out of pocket as little as possible....so then we can go buy MORE real estate! 

Personally, I have very thick skin so I'd take her attitude for a lot less than $300/month. 

That way you could acquire with hard money, put your own skin in the game via the repair costs utilizing your HELOC, and then refi out and get cash to pay off your HELOC and the hard money lender and keep the property as a rental.  

I too have faced difficulties in the past.

@Josh CasariI am going to assume you have run into some difficulty after starting this transaction.

There is an acceleration clause is most deed of trusts, that is, his mortgage document that calls for a full payment of a mortgage if the title is transferred in this manner, but people do it all the time and accept that is the mortgagee/lender ever exercises this clause then you'll just have to refinance the property and since you were paying the mortgage and have proof, you should have no difficulty in refinancing the property. 

.#3 how the deal is structured....do you have skin in the deal and have integrity, or are you going to take my money and run if you end up being in the 70%.