I view it as a "no eating in the library" rule.  

The exchange rules say that in order to defer 100% of capital gains taxes and depreciation recapture, you must spend all the equity received and buy property of equal or greater value.  

Hope this type of post isn't against any rules, but nothing is being sold so I figure it's okay.

The reason I ask is I'm trying to determine if you can drive up the value of 2-4 unit multis simply by raising the rent vs making capital improvements. 

I found what appears to be a fantastic fix n flip opportunity that, at least at first sight, outperforms the 70% rule.

You should still do credit and eviction check.The 3 X rule is for the average person with car payments, credit cards, etc.  

. $100,000 and is selling it to the C Buyer for $150,000.I have closed with investor-friendly title companies in California, but I am unsure if providing their info here is breaking the rules of BiggerPockets.

I've started researching various areas and the Airbnb rules.

@Sean Senatore thats definitely an improvement.

I always beat the 1% rule and have great Cashflow.