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What formula is used to figure out numbers that will generate cash flow?

Also I'd like to work such formulas into my PM app.

After searching the site, I can't seem to find the basic appreciation formula. 

Sure formula to destroy innate property value - - lack of maintenance / allowing the tenant to perform it.It's my asset; my retirement;my nest egg. 

Is there a formula for this?

Also 65% 70% isn't set in stone. may be you need to redo some of your number, if you really want the property REMEMBER 65-70% is for REHAB. as a realtor I no longer use this formula.

When the market is strong, the old methods (foreclosure sale, short sale, REO, etc.) leave little chance of applying the '70% - fix up' formula on but a few listings.

Des, In this case the formula in the OP still works; the HML underwriting criteria might change, but that can then be tweaked by the user of the formula.

Scott:So your formula is quite different from MikeOh's.