ConC return when using equity as part of down payment

[Dustan Fankhauser]

If I want to calculate my true Cash on Cash return of a property I am buying with $280,000 of the $350,000 down payment coming from equity I have in another property, would you use $70,000 (350-280) as the input? that is the actual "cash" I am putting in. Or do you use the full $350,000 as the input? Figured BP was a good place to turn for this!