Multiple Properties on same contract

[Ryan Rodgers]

Hello everyone..looking for some guidance for this possible opportunity.

There is a landlord in my area who is burnt out and selling her 4 properties. I would like to approach her with possible owner financing but want to make sure I approach her correctly before doing so. I guess the first question is..

Do I have to have a different contract for each property or can I put all 4 properties on the same contract?

Here are the numbers:

The most I'll pay for each home is 25k. (100k total)

Each home will need about 10k in rehab max. (0% credit card will pay when refinanced)

Looking for a 10 yr term at 8% with a $5,000 down payment (Financing 95k). Monthly note would be roughly $1200.

Each home rents for a min of $700. ($2800)

Minus tax, ins, 10% CapEx, and 10% Vacancy left with around 700 cash flow.

Are these numbers feasible? My ROI is looking huge but I'm not sure if I have something wrong here.