Welcome Paul..you found a fantastic forum here..I think you'll find it's like that old song said.."

Also, I was using cash flow return formula when looking at properties.

It sure is easy to fall for the siren song of the lenders, but that is a major problem with our entire society.

Does anyone know Section 8's magic formula for determining rent?

Don't waste your time OR an agent's time.The rough formula for the offer is:((ARV x 70%) - Repairs) = Offer (for rehab)If there are no repairs, NO ONE is going to sell you a perfectly good house at 70% of it's actual, current value.The formula for a WHOLESALER needs to be:(((ARV x 70%) - Repairs) x 90%) = Wholesale OfferIn other words, you need to get an EVEN BETTER DEAL than a rehabber if you hope to get paid for finding the deal without ruining the deal for the rehabber.

I don't like that I would be making 5% interest when I could be making 11% by keeping the condo.I'm trying to use the value = income/cap rate formula to find the value of keeping the condo, but I'm not sure what cap rate to use.

What formula do investors use to calculate expenses, do you subtract fee percentages from total expenses?  

I understand zestimate is perhaps the result of some robotic formula calculation; but it has to be based on something right? 

Cypress Hill's song Rock Superstar imagines an upstart's desire to "take **** from people who don't know what it is."

Have you heard that Rodney Atkins song, " If you are going through hell"...."