And that will determine whether you will be paying SE tax or not.  

But if you intend to hold it as a rental, now is as good a time as any to refinance, and the hard water and sewer issues aren't going to be visible to an appraiser, so they should not affect the value, per se (admittedly, they might hold up a sale based on inspection results, but they should not really impact an appraisal).

Its great to see another person who is involved in SE Was.

I currently own a duplex in SE Michigan, with a lower 2 bedroom flat and an upper 1 bedroom flat.

I currently own a duplex in SE Michigan, with a lower 2 bedroom flat and an upper 1 bedroom flat.

Can buyer rent the property while seller financing in effect and does the buyer need seller approval due or even share the rent to seller still own the property per se? 

Jason, I work all across the state but primarily SE Wisconsin and the surrounding counties.

Check it out here: https://www.biggerpockets.com/renewsblog/2015/11/08/flipsqualify-long-term-capital-gainspay-self-employment-tax/Most likely, you will not have to pay SE tax on the sale and you'll benefit from the long-term gain rates if you hold for >365 days.

SE Cape, fully rented & assessments paid.

Many instruments marketed as "debt" are not really debt per se.