The point there is that I am just one of 1 million landlords who own properties like that and so if you multiply out the effort - you will be spending an incredible amount of time chasing  lists & leads that are pointless.  

Let's say your future mortgage payment was going to be $1500, and rental income every month was $2500, we would calculate the amount we could offset by multiplying the rental income by 75% and then using that $1875 to completely offset the future mortgage. 

The amounts are raw dollar depreciation and need to be multiplied by your tax bracket to estimate the savings.

What general rule of thumb do you follow on a square footage multiplier when you are calculating rehab cost for a potential flip?

Take that $4,400 and multiply it by 2, 3 or 4 rentals. 

Assuming $70k in income, $20k in principle paydown, and $40k in other expenses your taxable income would only be $30,000 (multiplied by whatever tax bracket you fall into to estimate what you would owe).

A rule of thumb I tell clients in my market is to take the purchase price of the property and multiply by 0.012. 

If you take the $74,300 and divide it by .250% (or multiply by 4), then you get $297,200.  

Of the three Approaches to Value, if there are no exact comps with two houses on one  lot, as an Appraiser, I would probably give most weight to Income Approach; both the Gross Rent Multiplier and Direct Capitalization-hope this helps.

or building wealth to multiply your investment in the near future?