If you can borrow money at 6% from friends and family, that's a great rate - Hard Money lenders typically charge 10 to 15% (and also charge points up front).I would guess the biggest pitfall of borrowing from family and friends is if the deal went poorly and you weren't able to pay them back, as it could damage relationships.

They are probably taking the biggest risk.

Those with the biggest failures, and I am certain there are more failures than successes, are no longer on the forums.

The first one on Podcast 216 with Damion Lupo about his biggest regret really made me think hard on that and what that would be for me and how I can work toward resolving it.

The biggest thing I've learned is that there is no need to reinvent the wheel.

The biggest winners in this game have always been the City and the 1% richest. 

If they are really looking to sell, this is likely going to be the biggest boon to them.However, I'll also point out that a 1031 exchange is only for investment property.

This my friends is the BIGGEST question of them all.I am about to give you the most valuable advice I could give anyone.

The biggest reason I think is because they try to keep dues lower than they should be to handle what they're responsible for.

@Lee Ripma is correct that the zoning of the current parcel is the biggest factor.