He is considering seller finance because he would like to give his wife some residual income.

If there's upside this might work but it seems pretty tight otherwise since the numbers above don't include any closing costs or residual cash flow to you. 

It's an upstairs unit in a quadplex so it should even get residual heat from the neighboring and below unit.

Use the sprayer to wet the ceiling down again, go over it again with the sponge mop to get rid of the TSP residue.

I want residuals. the appreciate just looks good on my PFS and makes the bankers happy.

It's a great residual. 

Now, in a SFR this would be a crisis, but luckily, the other units had residual heat to that unit.

I used flipping to build cash fast, but it doesn't have residual income or on-going appreciation.I used flipping to build capital and then use the capital to buy rental properties. 

The master instructor then gets a percentage of testing fees etc. as residuals to fund their income and eventual retirement.

There are a LOT of reasons @Joshua Hively and I are really glad to be a part of HomeVestors in a time like this:1) Residual brand recognition: Even if we pull back on advertising and even if homeowners are not getting our mailers, they've heard of us and know we buy houses!