I'm curious to know what is the biggest thing you were blindsided with in doing a flip.  

As I can see it, the factors affecting the % return are the following:Purchase price / rental income ratioDecreasing the loan interest rateDecreasing maintenance costsIncreasing leverage (potentially the biggest factor as I can see)Is there anything that I am missing here to increase the cash on cash return?

Biggest advantage of finding a contractor through GAF is security in knowing they are a safe and trustworthy company that does good work.

The biggest mistake I made in my 40 year career was not investing in the very industry in which I made my living.

On Thursday, the Toronto Real Estate Board reported that July home prices in Canada’s largest city suffered their biggest monthly drop on record amid government efforts to cool the market and the near-collapse of Home Capital Group spooked speculators.

Your biggest asset if you plan to analyze multiple deals/ investment properties is purchase the BP property calculator (if you haven't already).

Find the biggest and best investor around who is very proud of what they have accomplished.

Your biggest hurdle is going to be finding one that makes sense.

The biggest reason for this that I've seen is the ability for each owner to separately complete a 1031 exchange following sale. 

In lower income areas, the biggest concerns brought up were quality of tenants (how they will treat the property and ability to pay rent on time), and also the limit of potential value.