It would provide a lower mortgage payment increasing your cash flow. 

That is usually determined by “local custom” though.

After rent increases to market rate of course.

Therefore, we had to move in a rental house and pay for storage for 3 months, on top of getting an extension on our loan, as well as increasing the amount we borrowed.

CoStar and other companies mentioned are trying to increase the volume / quality of data but even then this is a very fragmented industry.

Does it make since to make a break even cash flow to increase equity and take the tax advantages?  

I ended up winning, by increasing my offer to 152k but had to sign the addendum saying if it didn’t appraise I would have to bring the cash difference.

I would like to know what is the equation, or metric that I should use to judge one potential project vs another in terms of cost and the potential increase in revenue that money should create.

I'm struggling to estimate the increase or decrease in property taxes each year.

I was hoping to increase the purchase price to the appraised value and request a $11k credit for repairs.