Wholesale deal

[Umair Baig]

Hey BiggerPockets! I recently came across this wholesale deal from my mailing campaign, I dropped by the property today and spoke with the seller turns out there are two properties on one lot. One SFR that produces $1300/month. One two family home that produces $3300/month. I assumed this deal makes sense if I marketed it to landlords, my question was since I can't use the 70% method on this deal what formula do I use?? Any help will be greatly appreciated. Thanks.