Still working my corporate finance day job so that I can buy more properties in San Francisco with negative cash flow

If sold at $240 sqft *1840sqft= $441,600Sales price - all in price - sales commission (5%) = $441,600-$422,000-$22,080= -$480 (negative $480).As you can see, from this logic above, $250k should be absolute maximum amount any person (investor or individual) should pay, including myself.

If it is negative, it is included in your monthly liabilities.Example: $1,800 Monthly Rent * 75% = $1,350$1,500 PITIA Payment$1,350 - $1,500 = ($150)So you would carry $150 to your monthly liability payments.2.

And who also knows how to pull zip-code demographics, crime statistics, and other relevant data about a given neighborhood to help you make the best possible investing decision?

Tell me about the positives, the negatives, the myths and frustrations investors see...and what would benefit you as investors. 

I believe the statistic is that most renters move every 18 months due to job change, divorce, marriage, whatever.  

No one knows what house X at time Y with finish level Z sold for in statistical aggregate in average as an exact number.  

You would end up negative in this situation

I explained her monthly costs associated with all expenses were likely creating negative cash flow and I was offering her a way to make money each month without having to be a landlord.  

However, as I learned in business school, direct mailing is a low percentage play as the standard return rate is only 1-3%, including negative replies.